Premium Material: Our unit bearings are made of premium zinc alloy material, sturdy and wear-resistant, zinc alloy flange base with excellent quality and long service life. Easy to assemble: Pillow block set with ball bearing insert for ready-to-install installation. Metal bearing kit for maintenance and replacement of accessories for 3D printers. Adjustable Angle: The zinc alloy shaft bearing can be fixed between the inner bearing and the outer ring angle. Smooth running, low friction and high rigidity. Easy to Use: Bore bottom bracket is suitable for securely attaching to guided shafts, built-in pillow blocks, parts and accessories for 3D printers and other machines. Very helpful in holding the driveshaft. Wide Application: Insert pillow bearings with high-quality components can the efficient operation of the 3D printer, and can be used in machines such as conveyor belts, mechanical devices, machinery manufacturing, etc., which are suitable for household and industrial purposes. Colour: silver Material: zinc Size: 55x29x8mm Package Contents: 4 * Bearing housing 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.