Diablo�s Carbide Teeth Hole Saw Set for Plumbers features eight carbide teeth hole saws a Snap-Lock Plus� Mandrel System 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. High performance TiCo Hi-Density carbide hole saws deliver 50X 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.