... good and continuous working condition. For the grinder machine for knife , there are more selections for user to choose, like the ... and inventer and all screw. grinder machine for knife , knife grinding machine, knife sharpener Max.grinding length(mm):1500,2000, 2500 ... , 3000,3500,4500 can be selected. grinder machine for knife Precision type:High-precision, high transmission ball screws, efficiency ...