... in good and continuous working condition. For the grinder machine for knife , there are more selections for user to choose ... linear guide 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, ...