Product Description Wichard 1 3/4" Polycarbonate Sheave Features: Weight: .42 oz. (12 g) Sheave diameter: 1 25/32" (45 mm) Thickness: 1/2" (13 mm) Rope Size: 3/8" (10 mm) Pin Size: 3/8" (10 mm) Applications For static operations: mastfoot block, boom vang, mast head block