2-9/16', Switchblade Self-Feed Drill Bit, Designed To Drill Large Diameter Holes In Beams, Planks, Boards, Logs, Timber & Lumber, Recommended For Use In Continuous Torque Drills, Replaceable Blade Is Made Of Hardened Steel With An Aggressive Feed Screw Design That Makes Hole Drilling A Less Arduous Task, Designed For Drilling 2-9/16" Holes In All Types Of Wood For Pipe, Vents, Gas Lines & Bulk Wire Routing, Includes: (1) 2-9/16" Self-Feed Bit, 2 Replaceable Blades, 2 Feed Screws, 2 Set Screws & 1 Hex Wrench, Hexagonal Shank Offers Strong Grasp In Drill Chuck, Requires A Minimum Chuck Size Of 1/2", Compatible With 48-25-5550 Replacement Blade Set.