Oumefar 4pcs Plastic Shell U-groove Pulley Roller Metal U-type Guide Pulley Wheel Roller Bearing 0.3inch ID for Linear Motion System

【Well Sealed】The guide wheel bearing with sealing ring on both sides can prevent water, dust or other objects from entering, making the lubrication and maintenance interval of the wear-resistant bearing longer to save more lubricating oil 【High Quality Material】The guide pulley is made of high-quality Plastic material, industrial grade finishing makes it have excellent performance, especially has excellent friction resistance 【High Precision Process】The plastic pulley bearing is manufactured using motor-grade bearing technology and has good physical, mechanical and chemical properties which is a passive round pulley that can be used in Mobile doors and 【Wide Application】Our bearing wheels are suitable for many linear motion systems: such as industrial machinery, automobiles, ships, household appliances, healthcare systems, sliding doors and scooters and other skating applications, and can also be used for 3D printer roller bearingsmany use for many projects. 【Specifications】Our 0840UUguide wheel inner diameter: 8mm/0.3inch;outer diameter: 40mm/1.6inch; thickness: 20.7mm/0.8inch