Spline Shank Core Bits - drill bit 4 x 22 spline

One Piece for durabilty Carbide cutting teeth on Cup Carbide tipped pilot bit Universal Spline Shank Maximum drilling depth is 2-5/8 Includes ejecter key and center bit The Irwin Tools 325011- Drill Bit 4 x 22 Spline One-Piece Core Masonry Bit allowed the user to drill larger holes into masonry. This tool is ideal for making holes to run piping or conduit through masonry materials. The coring Bit has carbide teeth on the cup for cutting the materials and a carbide tipped pilot drill bit for starting the hole and aligning the core.