Our three Aluminum reducing bushing adapters set for 1-inch wide bench grinding wheels are with 3/4'',5/8'',1'' Arbor hole diameter, they have accurate dimensions with size#1: ID 1/2''x OD 5/8'' x H1'';#2: ID 5/8''xOD 3/4'' x H1'';#3: ID 3/4''x OD 1'' x H1''. Based on our intimate service, please contact us if you have any questions about our grinding wheel bushing or if you have recieved it with any flaw. 【Features】Three reducing bushing adapters set for 1-inch wide bench grinding wheels with 3/4'',5/8'',1'' Arbor hole diameter 【Specifications】Our Aluminum reducer bushing has accurate dimensions with size#1: ID 1/2''x OD 5/8'' x H1'';#2: ID 5/8''xOD 3/4'' x H1'';#3: ID 3/4''x OD 1'' x H1'', please make sure you need it before purchasing 【Smooth Cut】Bevel all corners to avoid too sharp to scratch your hand 【High Quality】This arbor hole reducer bushing kit is made of Aluminum which has strong rust resistance and durability 【Intimate Service】Easy and simple use kit, if you have any questions about our grinding wheel bushing or if you have recieved it with any flaw, please contact us by email