100 mm Roller Bearing Block - Single, Soft attachment Automatic Ratchet Block The upper stop is cast

The upper stop is cast aluminium

Seldén has developed a Main Sheet Track Calculator which is available on-line

SectMatch: F286

Length: 87

please see Sailmakers Guide

100 mm Roller Bearing Block - Single, Soft attachment Automatic Ratchet Block The upper stop is castThe RBB100 Single Roller Bearing Block is built for extreme loads and dynamic applications, featuring a large 100 mm sheave. Made from machined black anodized aluminium and equipped with Torlon roller bearings, this block provides superior strength and smooth operation. Polymer thrust bearings resist side loads, and a polymer washer insulates stainless from aluminium to prevent corrosion. The block is made for Soft attachment applications which means