... HTD Types:3M,5M,8M,14M Types:T2.5,T5,T10,T20 Bore types: SB,TB,QD Timing pullyBritish Types: MXL ... :3M,5M,8M,14MTypes:T2.5,T5,T10,T20Bore types: SB,TB,QDFeatures:1. Teeth Type: MXL,XL,L,H,XH,XXH ... AND SO ON2. Metric System: T-type series(T2.5,T5,T10,T20)3. HTD type(3M,5M,8M,14M)4. STPD/STS ... type(S2M,S3M,S4.5M,S5M,S8M,S14M ...