Description: Maintenance free, self lubrication, no need to refuel. Mainly used in industry: handling, casting industry, dust workshop, automation equipment, field work, fitness equipment, etc., do not recommend the use of large machines. Matching shafts: aluminum shaft, steel shaft, stainless steel shaft, hard chrome shaft, carbon fiber shaft It is suitable for 3D printer. Corrosion-resistant, dust proof, Shock proof, noiseless, no injury shaft, clean (no lubricant) With superior wear-resistance and Apply very well to rotation, swing and linear motion. Specification: Outer diameter: about 16mm/0.62'' Inside diameter: about 8mm/0.31'' Length: about 25mm/0.98'' Tolerance: 0.00~0.04 Large dynamic load: 250N Large static load: 1750N Color: Grey Package Includes: 1x Bearing Note: Please allow 1-3 cm differs due to manual measurement. Due to the different display and different light, the picture may not show the actual color of the item. Thanks for your understanding