Belt Pulley 1.V-belts: SPZ, SPA, SPB, SPC; A, B ... nylon, aluminum 3.OEM,fast offer Belt Pulley's feature:1. European standard: a. V-belt pulleys for taper bushings: SPZ, SPA ... grooves b. Adjustable speed V-belt pulleys and variable speed pulleys c. Flat belt pulleys and conveyor belt pulleys 2. American standard:a ... delivering6. OEM service with fast offer, competitive price, quick delivery. belt pulley