At first this seemed great... Got the jig in place, attached the 2 1/8" hole saw and went to town. Sure some of the plastic jig got chewed off but whatever I expected that.. It want much... Getting the mandrel off was a herculian effort but I got it off finally... Went to attach the 1" hole saw to mandrel and found it doesn't fit... Not even close. The threads for it are substantially smaller so it is essentially useless to me. there is no way to get it in the supplied mandrel. None... Now I have to go to the hardware store and get the right tools when I thought thats what I spent $20 on in thr first place. This product is junk. If all u need is to use the 2 1/8" hole saw this is the overpriced tool for you... If you'd like your door to have the hole for the deadbolt stay far away from this item. Seriously.. I just bought this yesterday and my next order of business is hate mail to Irwin and asking for a full refund.