Chain Sharpener it works automatically. easy to operate. with GS/CE certificate Chain SharpenerRated voltage: 230v~50HZInput power: 220WNo load speed: 7500r/minGrind wheel diameter:φ100Xφ10X3.2/4.5mmPacking size: 56.5x28x41.5cm/6pcsLoading Q'ty: 2580pcs/20GP Chain Sharpener