Double Swing Side Pulley Sheave 100mmStainless Steel Double Swing Side Pulley Sheave 100mm This stainless steel swing side snatch block features two lightweight 100 mm diameter deep groove aluminium sheaves, with stainless steel plates that swing open to install 12mm diameter rope. Sintered bronze bushings on stainless steel shaft provides 98% efficiency. When you use this pulley with a PCA 1274 pulley, you can quadruple the pulling power of the winches. With two double pulleys, an