... ,T5,T10,T20 Bore types: SB,TB,QD Timing pullyBritish Types: MXL,XL,L,H,XH,L,H,XH,XXHHTD Types:3M ... ,T10,T20Bore types: SB,TB,QDFeatures:1. Teeth Type: MXL,XL,L,H,XH,XXH,XXL,SL9,SL12,SL,HTD:3M ... ,S4.5M,S5M,S8M, S14M)5. The British System:MXL,XL,L,H,X6. Material:1045 carbon steel, aluminum alloy frequently ... . Tolerance:conform to customers requirement9. OEM/ODM service:offered Aluminum timing pulley