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Type: Window Rollers Model Number: Ball Transfer Bearing Material: nylon Mounting Hole Dia: 5mm/0.2-inch Two screw holes Ball Transfer Unit are omni-directional load-bearing spherical balls mounted inside a restraining fixture.system, processing machinery. colour:silver white Material:nylon size:70 x 50 x 30mm(1inch)/48*20*32mm (0.5inch) Only the above package content, other products are not included. Note: Light shooting 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.