Diablos new 13-Piece Carbide Teeth Hole Saw Set is designed with the plumber in mind. Featuring eight carbide teeth hole saws, a heavy duty SnapLock Plus mandrel, two pilot bits (carbide and cobalt), and two threaded adaptor nuts (1/2 and 5/8), this innovative solution for plumbers delivers quick and easy hole saw cup changes for maximum job performance. This high performance carbide hole saw set delivers 50-times longer cutting life, faster cutting performance and increased productivity. Diablo's carbide hole saws are the industry's first carbide hole saws to cut both wood and metal. Unlike anything on the market, Diablo's hole saw system and mandrel design simplify the attachment process for fast and efficient hole saw mounting. These radical hole saws provide ultimate cutting length to bore deeper holes in a single pass; and a tool-free plug ejection and Variable Tooth Design for faster cuts.