Lifetime warranty. Cuts 5 times faster than hole saw cutters. Made from the Super alloy, Cobalt . 4 piece spot weld cutters cover all applications. Packaged in an attractive cherry wood box Cobalt is the cutting tool metal for all premium cutting tools. This is the first set of spot weld cutters available in the automotive aftermarket made of a cobalt alloy. This is a four piece kit-1/4", 5/16", 3/8" and 1/2" sizes packaged in a beautiful cherry wood box, a premium that will be taken home. Spot weld cutters feature patented self centering tip design, the tip prevents walking, one piece construction increases overall strength, and they are safe for pneumatic drill use. In addition to the high quality, fast cutting, and long lasting capabilities, these cutters have a LIFETIME GUARANTEE. If for any reason the user is not satisfied, he may send the cutter back to S and H Industries with a nominal shipping and handling charge and we will send a new replacement- and he can do this forever.