0840UU 8x40x20.7mm Nylon Coated U Groove Guide Pulley Wheel Roller Bearing, Type Rail Ball 4Pcs

PREMIUM QUALITY MATERIAL--These U-Groove Bearings are made of high quality material, which are and wearable enough to ensure a long lasting performance OFFERS SMOOTH WORKING PROCESS--There are internal lubrication grease in the U-Groove Wheels, which can provide a smooth and good mute effect U SHAPE DESIGN OFFER BETTER PERFORMANCE--These Pulley Rail Ball Bearings adopts with a U-shape groove design, which have smooth to reduce friction HIGH-VALUED PACKAGE--There are total 4 pieces of pulleys in one set that you many use for many projects upon your purposes WIDELY APPLICATIONS--These U-type Groove Pulleys have widely applications during daily life, and they can be widely used in doors and to track and drive mechanical equipment.