A strong, durable and economical block with a unique Captive Lock universal head fitting that allows the block to be fixed in either of two planes, or to swivel freely. The sheave runs on low-fiction, very low-maintenance solid bearings. Loads are transferred directly from the sheave axle to the head post by the one-piece 316 stainless steel load straps. Lightweight Cheek cut-outs for easy bearing maintenance Nylatron sheave Bearings: Low-friction plain bearings Sheave Size: 2" (50mm) Line Diameter: 1/2" max. Grade 316 stainless steel load strap and head fitting Shackle/Strap Type: Universal head shackle. Either locks (0 or 90) or swivels