4 U Type Bearing Pulleys 8 x 40 x 2 cm Black

Inner diameter: 8 mm; Outer diameter: 40 mm; Thickness: 20.7 mm; Weight: approx. 109 g. Internal lubrication grease, smooth operation, good muting effect. U-groove design, smooth reducing friction. Made of high quality material, these pulleys are durable, sturdy and easy to carry. There are a total of 4 pieces of pulleys in one set that you often use for many projects. Widely used in doors and windows to track and drive mechanical equipment. Precautions: It is recommended to lay hot products, keep the bearing and working environment clean, pay attention to rust prevention