3/8" shank quick change mandrel (fits hole saws 9/16" to 1-3/16") offers a tool-free quick-release collar to prevent hole saws from locking to the mandrel. This mandrel features double set screws with a recessed combination head for quick and easy centering bit changes. Hardened steel construction, which has been tested through 15,000+ cycles, delivers jobsite durability. Pilot bits feature the patented Pilot Point tip for faster material penetration, particularly in metal. Carded.