The types of timing pulleys we can provide: Types Pitch HTD 3M, 5M, 8M, 14M, 20M AT AT5, AT10, AT20 T T2.5, T5, T10, T20 MXL 0.08" (2.03mm) XL 1/5" (5.08mm) L 3/8" (9.525mm) H 1/2". (12.7mm) XH 7/8" (22.225mm) XXH 1 1/4"(31.75mm) STPD S2M,S3M,S4.5M,S5M,S8M,S14M RPP 5M,8M,14M,20M PGGT 2MR,3MR,5MR,8MR,14MR PCGT 8M,14M