... computer engraving machine, engraving machine grinder sharpener is aimed at turning tool, bit, cutter, carving knife, computer engraving machine, ... and inventer and all screw. grinder sharpener , knife grinding machine, knife sharpener Max.grinding length(mm):1500,2000, 2500 ... , 3000,3500,4500 can be selected. grinder sharpener Precision type:High-precision, high transmission ball screws, ...