I saved the instruction manual by file separately, but thick things were drilling holes. With a drill, only a part of the hole was raised when opening a hole. This drill punch has a smooth hole and is saved.
It takes time and labor to align, puncture, but the frequency of use is as low as 1 or 2 times a year, so there is no problem. The price of less than 1/4 of other punches for thick materials is attractive.