U- Pulley Roller 0840UU U Type Wheel for Hardware Doors Windows Track Drive Mechanical Equipment 8x40x20.7mm 4pcs

SMOOTH OPERATION: Internal lubrication grease, smooth operation, good mute effect., U-SHAPE DESIGN: Smooth surface reduces friction., APPLICATION: Widely used in doors and windows to track and drive mechanical equipment., MATERIAL: Made of high quality material, these pulleys are , sturdy and wearable., 4 PIECES IN ONE SET: There are total 4 pieces of pulleys in one set that you many use for many projects., , , , ,