The MILWAUKEE 12-Piece HOLE DOZER Bi-Metal Hole Saw Kit features Rip Guard, the strongest tooth form in the industry, backed by the Rip Guard Limited Lifetime Tooth Break Warranty, an industry first. Each tooth is built with more steel behind the cutting edge for added strength. This added tooth strength with 8% cobalt provides longer tooth life, giving users increased productivity on the jobsite, as well as continued hole quality. The HOLE DOZER Hole Saws include an All-Access Slot design that gives users full access during plug removal. These All-Access Slots increase productivity and eliminate wasted downtime between holes by providing better access. For fast, tool-free change-outs, use Milwaukee's Universal Quick-Change Arbors: 49-56-7240, 49-56-7250, and 49-56-9100.