5mm Bore 6mm GT2 Belt Smooth Idler Pulley Aluminum W/Bearing for 3D PrinterGT2 Timing Pulley 16 Teeth 6mm Bore, 2mm Pitch, 6mm Width for 3D Printers This GT2 timing pulley is made for 3D printer setups, especially those using a 6mm shaft and 2mm pitch belts. With 16 teeth and a 6mm wide belt groove, it's a perfect fit for precision motion control on systems like Kossel Delta and other RepRap style printers. Tooth count: 16 teeth Pitch: 2mm (GT2 standard) Belt width: 6mm Bore size: 6mm Material: Aluminum Application: Drive