High-quality zinc alloy: Our ball bearings are made of high-quality zinc alloy, which ensures strength, wear resistance and durability. Thanks to these high-quality materials, they guarantee a long service life and reliable performance. Easy to use: set screw clamping ring for secure attachment to guided shaft. Built-in pillow bearings, parts and accessories for 3D printers and other machines. Very helpful in holding the drive shaftEasy installation: the assembly of our ball bearings is very easy. With a user-friendly design, they can be installed quickly and effortlessly without complicated tools or professional help. Versatile use: our ball bearings are used in a variety of applications effortlessly carry heavy loads, whether it is versatile in machinery, vehicles, electrical appliances or other industrial areas. Smooth rotation: thanks to their precise ball shape and low friction, our ball bearings provide smooth rotation and ensure efficient performance, fine tuning can be made between the inner bearing and the outer mounting ring Material: zinc alloy. Inner diameter: 12 mm (KP001). Size: 71 x 16 x 38 mm (KP001). Package includes:6 x pillow block bearings. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.