Precision ground, heat treated tools made from M2 HSS that can easily cut thru the stock rather than ripping, tearing, and pushing thru as do typical hole saws;Can produce holes 3 times faster and cleaner than hole saws in sheet metal and have a dramatically extend tool life;Produce holes from 11/16 up to 3 diameter in sheet metal, rubber, gasket or fiber materials, and some plastics up to 1/8 thick;Ideal for aftermarket installations, custom fabrication, gauge installation, and modification of trailers;Patented quad-lead thread system, making cutter changes quicker than over before