Selden 404-101-02 Block, BBB40 Single Strap Shop-by-Boat-4000-4000-Hull-Parts They have 4 x 5mm

They have 4 x 5mm holes with an 11mm recess to take a pan head screw/bolt

Knife pocket at front with easy to open construction

ensure you seal the screw in the mounting as a leak here will allow water directly into the hull

guaranteeing you many years of trouble free service

The webbing is an expensive spectra webbing so that it slips nicely along the boom

Selden 404-101-02 Block, BBB40 Single Strap Shop-by-Boat-4000-4000-Hull-Parts They have 4 x 5mmTechnical Features Stainless Steel ball bearing races, stainless Steel ball bearings and glass fibre reinforced sheave for best bearing strength even under high dynamic loads Acetal bearing cage to prevent ball to ball friction and to reduce weight Composite, 50 50 Glass Fibre Polyamide Specification Max. Rope (mm) S. W. L (kg) B. L (kg) Weight (g) 10 250 500 45