25mm Wire Block with Shackle Lightweight, low-friction wire blocks carry wire halyards and high-strength control lines on boats of all sizes. Specifications: Sheave: 25mm / 1in. Weight: 28g / 1oz. Shackle pin: 5mm / 3/16in, Maximum wire: 2mm / 3/32in. Maximum line: 4mm / 5/32in. Maximum working load: 454kg / 1000lb Breaking load: 907kg/ 2000 lb

25mm Wire Block with Shackle - Fishing Lightweight, low-friction wire blocks carry wire halyards and high-strength control lines. Specifications: Sheave: 25mm / 1in. Weight: 28g / 1oz. Shackle pin: 5mm / 3/16in, Maximum wire: 2mm / 3/32in. Maximum line: 4mm / 5/32in. Maximum working load: 454kg / 1000lb Breaking load: 907kg/ 2000 lb

25mm Single Block with Shackle The 25mm plain bearing block range is one of SeaSure's oldest and best-selling ranges. The range uses marine-grade stainless steel side plates and rivets with an arnite (plastic) sheave, which is incredibly hard-wearing and light.  Features: This range could be used to create purchasing systems for lifting, garage door mechanisms, storage solutions, etc. The 00.08 features a shackle attachment at the top so that the block can be connected to an attachment point quickly and easily Specifications: Max Rope: 8mm Breaking Load: 500kg

25mm Double Block with Shackle The 25mm plain bearing block range is one of SeaSure's oldest and best-selling ranges. The range uses marine-grade stainless steel side plates and rivets with an arnite (plastic) sheave, which is incredibly hard-wearing and light. Features: This range could be used to create purchasing systems for lifting, garage door mechanisms, storage solutions, etc. The 00.21 can be used to create a 4:1 purchase system to aid in lifting heavier objects and decrease the load on the rope Specifications: Max Rope: 8mm Breaking Load: 1000kg

25mm Treble Block with Shackle The 25mm plain bearing block range is one of SeaSure's oldest and best-selling ranges. The range uses marine-grade stainless steel side plates and rivets with an arnite (plastic) sheave, which is incredibly hard-wearing and light.  Features: This range could be used to create purchasing systems for lifting, garage door mechanisms, storage solutions, etc. The 00.31 can be used to create a 6:1 purchase system to aid in lifting heavier objects and decrease the load on the rope Specifications: Max Rope: 8mm Breaking Load: 1250kg

Wire Block w/Removable Clevis Pin Head - Nylatron® Sheave - 25mm(1") Sheave Diameter Wire blocks have purpose designed narrow sheaves and grooves. Features: Removable clevis pin head Applications: Wire blocks suit halyards, vang and backstay applications Materials: Grade 316 stainless steel cheeks Nylatron® sheave Specifications: Sheave Ø: 25mm(1") Max. Cable Ø: 3mm(1/8") M.W.L:450kg(990lbs) B.L.: 900kg(1,980lbs) Weight: 40kg(1.4oz)

40mm Carbo Block with Spring & Eyestrap Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to the popular Harken Black Magic block line, these small, compact blocks have very high working loads for safe, easy trimming.  Features: Sheave Ø (mm): 40 mm Sheave Ø (in): 1-9/16 in Maximum line Ø (mm): 10 mm Maximum line Ø (in): 3/8 in Maximum working load (kg): 220 kg Maximum working load (lb): 485 lb

25mm Single Block with Clevis Pin The 25mm plain bearing block range is one of SeaSure's oldest and best-selling ranges. The range uses marine-grade stainless steel side plates and rivets with an arnite (plastic) sheave, which is incredibly hard-wearing and light.  Features: This range could be used to create purchasing systems for lifting, garage door mechanisms, storage solutions, etc. The Clevis Pin attachment makes the block easy to fit and remove from lacing eyes, eye bolts, U bolts, etc. Specifications: Max Rope: 8mm Breaking Load: 500kg

25mm Single Block with Becket The 25mm plain bearing block range is one of SeaSure's oldest and best-selling ranges. The range uses marine-grade stainless steel side plates and rivets with an arnite (plastic) sheave, which is incredibly hard-wearing and light.                                                          Features: This range could be used to create purchasing systems for lifting, garage door mechanisms, storage solutions, etc. The 00.11 features a becket at one end and a clevis pin attachment at the other, so this block could be used for creating a purchase system and easily attached to a fixing point with the clevis pin attachment Specifications: Max Rope: 8mm Breaking Load: 500kg

25mm Single Block with V-Jam The 25mm plain bearing block range is one of SeaSure's oldest and best-selling ranges. The range uses marine-grade stainless steel side plates and rivets with an arnite (plastic) sheave, which is incredibly hard-wearing and light.                        Features: This range could be used to create purchasing systems for lifting, garage door mechanisms, storage solutions, etc. The 00.13 has a becket attachment to splice or tie off to, as well as a V Jammer This block could be used to create a 2:1 purchase system for lifting that can be easily locked off on the V Jammer Specifications: Max Rope: 8mm Breaking Load: 500kg

16mm Double Block with Becket  The 16 mm is Harken’s® smallest block. It is perfect for small synthetic control lines found on high-tech dinghies. The patented bearing system uses stainless steel balls in a captive grooved race. Specifications: Sheave: 16mm / 5/8in Length: 54mm / 2-1/8in Weight: 28g / 1oz Maximum line: 5mm / 7/32in Maximum working load: 204kg/ 450lb Breaking load: 544kg / 1200lb

16mm Triple Block with Becket The 16 mm is Harken’s smallest block. It is perfect for small synthetic control lines found on high-tech dinghies. The patented bearing system uses stainless steel balls in a captive grooved race. Specifications: Sheave: 16mm / 5/8in. Length: 57mm / 2-1/4in. Weight: 43g / 1.5oz Maximum line: 5mm / 7/32in Maximum working load: 318kg/ 700lb Breaking load: 544kg / 1200lb

25mm Double Block with Becket The 25mm plain bearing block range is one of SeaSure's oldest and best-selling ranges. The range uses marine-grade stainless steel side plates and rivets with an arnite (plastic) sheave, which is incredibly hard-wearing and light.  Features: This range could be used to create purchasing systems for lifting, garage door mechanisms, storage solutions, etc. The 00.23 can be used to create a 4:1 or 5:1 purchase system to aid in lifting heavier objects and decrease the load on the rope Specifications: Max Rope: 8mm Breaking Load: 1000kg

25mm Double Block with V-Jam The 25mm plain bearing block range is one of SeaSure's oldest and best-selling ranges. The range uses marine-grade stainless steel side plates and rivets with an arnite (plastic) sheave, which is incredibly hard-wearing and light.  Features: This range could be used to create purchasing systems for lifting, garage door mechanisms, storage solutions, etc. The 00.25 can be used to create a 4:1 or 5:1 purchase system to aid in lifting heavier objects and decrease the load on the rope The V jammer enables you to lock off the rope Specifications: Max Rope: 8mm Breaking Load: 1000kg

25mm Treble Block with Center Becket The 25mm plain bearing block range is one of SeaSure's oldest and best-selling ranges. The range uses marine-grade stainless steel side plates and rivets with an arnite (plastic) sheave, which is incredibly hard-wearing and light.  Features: This range could be used to create purchasing systems for lifting, garage door mechanisms, storage solutions, etc. The 00.32 can be used to create a 6:1 purchase system to aid in lifting heavier objects and decrease the load on the rope Specifications: Max Rope: 8mm Breaking Load: 1250kg