Review on 📚 Inton Adjustable Bookbinding Punches with Handle by Donald Cummings

I used this to punch 14 holes in a sheet of 1/8 inch neoprene rubber. the tips don't seem to be particularly sharp instructions are only in chinese i had to lubricate the focuser mechanism several times with lithium grease otherwise it started to stick. Doesn't bode well for longevity. The price is very low. I feel like I've already got my money back.