GT2 20 Toothless Bore 5mm Aluminum Timing Belt Idler Pulley For 3D Printer 6mm Width Timing Belt (Pack of 10Pcs) Used for GT2 6mm Wide Timing Belt._x000D_ 20 Toothless timing belt idler pulley, bore 5mm._x000D_ Widely used in milling machine, gear shaper, drilling machine, CNC engine lathe, hobbing machine or other machinery transmission._x000D_ colour:Silver_x000D_ material:aluminum_x000D_ size:Bandwidth 6MM, aperture 5mm_x000D_ Package Contents:_x000D_ 10 * 20Toothless Timing Belt Pulley Bore 5mm_x000D_ Only the above package content, other products are not included._x000D_ Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_