Diablo, 1-3/8'', step drill bit, 15 steps, 7/8" to 1-3/8", impact, fast, accurate cuts & increased stability in thin metals, pvc, & other plastic materials, innovative split point tip design enables fast, on point start resulting in increased durability & up to 4x longer life, precision grinding process on each step reduces wear & delivers 2x faster cut, designed with 1/4" hex shank, can be used with drills & impact drivers, split point tip 132 degree, corded & cordless tool efficiency in high speed mode for up to 75 percent more holes per battery charge.