Reducing bushing adapters are suitable for different size of grinding wheel and sanding wheel Multi-sizes adapters make using of bench grinder variable and saving cost. Material: bearing steel is rust-prevention and . The three sleeves with different inner diameters are simple in structure and easy to use, and are often used for high-precision machining. It is suitable for a 1-inch wide bench-type grinding wheel. The shaft sleeve can be installed to balance the grinding wheel, reduce vibration during rotation, and have a low friction coefficient and no noise. Bearing steel material, high-frequency quenching treatment, wear- and , and does not require frequent maintenance. Will not deform, age or crack as easily as traditional plastic bushings Easy and simple use kit. Dimension: #1,ID 1/2inchx OD 5/8inch x L1inch; #2,ID 5/8inchx OD 3/4inch x L1inch; #3,ID 3/4inchx OD 1inch x L1inch Colour:Gray steel Material:Bearing steel Package Contents: 1 Set x Reducing Bushing Adapters Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.