PREMIUM MATERIAL - These bearings are made from carbon steel for durability and long service life. FOR LINEAR MOTION SYSTEM - These are specialized bearings that are used in many linear motion systems. 10PCS/SET - There comes total 10 pieces of bearings which you may use for many different projects. 1.8MM DEEP U GROOVE - These mini ball bearings have 1.8mm deep U groove that generally ride on a rail or track. DOUBLE - They are double shielded to avoid entering and save lubricant. Specifications:
Material: Carbon steel
Model: U624ZZ
Inner Diameter: 4mm / 0.15"
Outer Diameter: 13mm / 0.51"
Height: 7mm / 0.27"
U Width: 5.2mm / 0.2"
U Depth: 1.8mm / 0.07"
Quantity: 10pcs

Package Includes:
10 x Bearings