Small, lightweight, free-running blocks utilizing stainless steel sideplates, lightweight Delrin sheaves, and carbon-black Delrin ball bearings. Use for Cunninghams/Outhauls, vangs, traveler controls, barberhaulers, flag halyards, leech cords or lead car return tackles. Standard features are; Sheave dia.7/8" (22 mm), Max line dia.1/4" (6 mm), Breaking strength; 1200lbs.