... tensioner, tensioner bearing, timing tensioner, steel sheave, conveyor pulley are high quality and most competitive in market.Features:Teeth Type: MXL,XL ... ,14M,20M AND SO ONMetric System: T-type serie(T2.5,T5,T10,T20)HTD type(3M,5M,8M,14M)STPD ... System:MXL,XL,L,H,XMaterial:1045 carbon steel, aluminum alloy frequently used,brass and nylon available.Surface treatment:black oxdizing ...