2GT Timing Pulley Model K+BFType: A form timing pulley 20T+80T-2GT-6mm Pitch: 2mmTeeth Number : 20+80T teethBore:3/4/5/6/8/10/12mmFlange: DoubleMaterial: 6061 Aluminium AlloyFixed mode: 2* M4Fit for Belt Wide: 6Belt length:250mm、300mm、320mm、360mm、380mm、400mm、450mm、500mm、600mmIf you want different units of wheels or belts, please contact me!