Features: These bearings are made of high quality carbon steel for durability and long service life. They are double shielded to prevent contaminants from entering and save lubricant. The bearings have a 1.8mm deep U-groove which is usually mounted on a rail or track.
These are specialized bearings that are used in many linear motion systems.
There are a total of 10 pieces of bearings that you can use for many different projects.

Specifications:
Material: carbon steel.
Model: U624ZZ
Internal diameter: 4 mm/0.15 inches.
Outer diameter: 13 mm/0.51 inches.
Height: 7 mm/0.27 inches.
U-slot width: 5.2 mm/0.2 inches.
U slot depth: 1.8 mm/0.07 inches.
Quantity: 10 pieces.

Package includes:
10 x Bearing