SPEEDBOR MAX 2-1/8 in. Self-Feed Bit

Feed screws has a coarse thread for fast boring. Spurs on the outside diameter cut holes clearly and accurately; 7/16 in. Quick Change impact shank for use in applications such as large diameter holes in wood for pipe, conduit. Includes: Each bit is packaged with one hex key and two feed screws. 3X Cutting edges extends bit life compared to standard IRWIN self-feed bits. Aggressive Screw Pitch.