I bought this kit because I needed a 5 inch saw to cut holes in the Rubbermaid pusher to clear the dryer vent to lead to the ceiling. After two cuts with a drill half the blades were gone, great value for money, I just didn't expect them to last long when cutting tougher materials. I will say I used the smaller piece to cut through the plastic and it worked great. However, one of the starter attachments is ripped off with Alan's wrench and easily falls out.