BEMONOC 2GT Timing Pulley 20 Teeth 5mm Bore fit GT2 Belt Width 6mm and 3D Printer Parts Product Name: GT2 Timing pulley; Teeth Number: 20 teeth; Bore of Timing pulley: 5mm; Timing Pulleys With Small Backlash. Suitable for Positioning; High Accuracy Positioning; Fit For Reprap 3D printer Prusa Mendel CNC; Package Listing Includes: 5pcs x GT2 20 Teeth Timing Pulley + 10pcs x M4 setscrews + 1pcs x Allen Key