... Types:3M,5M,8M,14M Types:T2.5,T5,T10,T20 Bore types: SB,TB,QD Timing pully British Types: ... Types:3M,5M,8M,14M Types:T2.5,T5,T10,T20 Bore types: SB,TB,QDTiming pullyBritish Types: MXL,XL, ... ON2. Metric System: T-type series(T2.5,T5,T10,T20)3. HTD type(3M,5M,8M,14M)4. STPD/STS ... System:MXL,XL,L,H,X6. Material:1045 carbon steel, aluminum alloy frequently used,brass and nylon available.7. Surface treatment ...