I used a different manufacturer's oil cutter but purchased it because I used it for a long time and stopped running. There is only high price, sharpness outstanding, afterwards I wish I could use it for a long time. The way oil is exquisite. When I put oil in for the first time, it rushed to the cutting edge very easily and it got impatient. There is a cylindrical case of resin that can be stored stand up conveniently. As for improvement, I think that it is good if it is possible to change the angle of the part which is wanting to flatten the black resin part. When oil is added, the part of the blade with the blade part facing up and the oil remaining in the brass part does not completely hang, the oil attached to the part of the brass screw will come out and become dirty after tightening.