Item Type: Square Hole Drill Bit_x000D_ Material: Bearing Steel_x000D_ Drill Bit Diameter: Approx. 6.4mm / 1/4in_x000D_ Usage: Suitable for wood products such as density board, medium fiber board, particleboard, wood, etc., work with square hole drilling machine, square tenon machine 1Multi Purpose: This mortise chisel drill bit is suitable for wood products such as density board, medium fiber board, particleboard, wood, etc. 2Alloy Drill Bit: The drill bit is made of alloy steel, with overall heat treatment, has high hardness and long service life. 3Long Chip Removal Slot: U long chip discharge slot design facilitates wood chip discharge, improve drilling efficiency. 4Drill Sleeve Design: The stress of the drill sleeve flute is in a plane, which can effectively prevent from bursting at the beginning of use. 5Universal Shank: Adopt round drill shank, which makes the clamping more stable, suitable for square hole drilling machine, square tenon machine.1 x_x000D_ _x000D_ SquareHoleDrillBit