Seasure Blocks

Seasure's compact 25mm blocks are a fixture of British dinghy sailing - simple, light and dependable, with a configuration for every corner of a small boat. This collection covers the range: single and double blocks, swivel and base-mount blocks, bolt-down and cheek blocks, blocks with V jammers, hollow rivet and clevis pin mountings, and in-line mast sheaves.

The variety of fixings is the point: hollow rivet blocks build into control line systems, clevis pin and shackle versions hang off fittings, and bolt-down and base-mount blocks anchor to deck or spar exactly where you need a turn. Match the block to your line diameter and load, and replace a stiff or cracked block promptly - control lines only work as well as their worst pulley.