... standard 2. OEM production with good quality, reasonable price 3. Standard,non-standard Timing belt pulley, Aluminium Timing ... SL9,SL12,SL,HTD:3M,5M,8M,14M,20M AND SO ON2. Metric System: T-type series(T2.5 ... ,T5,T10,T20)3. HTD type(3M,5M,8M,14M)4. STPD ... :1045 carbon steel, aluminum alloy frequently used,brass and nylon available.7. Surface treatment:black oxdizing,phosphating, ...