No arbor required. Split point pilot bit for faster penetration and less walking. Over sized slot in hole saw for easy plug removal with low torque, little pressure required for fast, easy cutting. Continuous, brazed edge lasts longer in tile and stone.
IRWIN 1877714 Countersink Drill Bit, 1/4 in Dia, 1-17/32 in OAL, 5-Flute, 1/4 in Dia Shank, Round Shank
IRWIN 1877715 Countersink Drill Bit, 3/8 in Dia, 1-5/8 in OAL, 5-Flute, 1/4 in Dia Shank, Round Shank
IRWIN 1877720 Countersink Drill Bit, HSS, Black Oxide
IRWIN 1877793 Countersink Drill Bit, HSS, Black Oxide