Walfront 20pcs V623ZZ Miniature Steel V-groove Guide Pulley Rail Ball Bearing 3x12x4mm for Rail Track Liner Motion System
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Features :
These bearings are made from high quality carbon steel for durability and long service life
They are double shielded to avoid contaminants entering and save lubricant
Bearings have 1.4mm deep V groove that generally ride on a rail or track
These are specialized bearings that are used in many linear motion systems
There comes total 20 pieces bearings which you may use for many different projects