... HTD Types:3M,5M,8M,14M Types:T2.5,T5,T10,T20 Bore types: SB,TB,QD Timing pullyBritish Types: ... MXL,XL,L,H,XH,L,H,XH,XXHHTD Types:3M,5M,8M,14MTypes: ... L,H,XH,XXH,XXL,SL9,SL12,SL,HTD:3M,5M,8M,14M,20M AND SO ON2. Metric System ... series(T2.5,T5,T10,T20)3. HTD type(3M,5M,8M,14M)4. STPD/STS type(S2M,S3M ... to customers requirement9. OEM/ODM service:offered Aluminum timing pulley