Our company is specialized manufactory in pulley driving and have acquired ISO9001-2008 certification and automatic registration of import and export trading right. we can provide variable pulleys , esp. SPZ/SPA/SPB/SPC and taper sleeves.ISO Standard pulleys TB taper bore pulleys straight bore pulleys P.D. number of slots TB P.D. number of slots SPZ 56-630 1~6 1008~3030 50-400 1~3 SPA 60-1250 1~6 1008~4545 50-630 1~5 SPB 80-1250 1~10 1210~5050 63-630 1~6 SPC 160-1250 1~10 2517~5050 100-630 1~6 Material :cast iron GG25Package:in wooden cast