PREMIUM QUALITY MATERIAL--These U- Bearings are made of material, which are and wearable enough to ensure a long lasting performance
OFFERS SMOOTH WORKING PROCESS--There are internal lubrication grease in the U- 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 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 Pulleys have widely applications during daily life, and they can be widely used in doors and to track and drive mechanical equipment.
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