... 3)Zinc-plated and gal. 4)consist of a single, double Wood BlockPulley Blocks for Wire Rope,chainPulley blocks, also known ... lasting for use in slower moving applications. Roller bearings spin freely without resistance. Ball bearings have less friction, making them ideal for ... " ___ 2 13/16" 3213T59 • 8.65Pulley Blocks with Double PulleyZinc-Plated Steel Housing with Zinc-Plated Steel Pulley— Plain ...