Description:
Made of high quality material, these wheels are , sturdy and .
There is grease, it is quiet running, good effect.
U-shape groove design, smooth surface can reduce the friction.
There are a total of 4 roles in a set that you use for many projects.
It uses wide in doors and windows to track and control mechanical devices.

Specifications:
Model: 0840UU
Type: U-groove
Material: metal, plastic
Color: Black
Inner diameter: 8mm / 0.3in
Outer diameter: 40mm / 1.6in
Thickness: 20.7 mm / 0.8 inches
Quantity: 4 pieces
Weight: 109g (approx.)

Package includes:
4 x rolls