Item Type: Square Hole Mortiser Drill Bit_x000D_ Material: Bearing steel + alloy steel_x000D_ Uses: _x000D_ Suitable for wood products such as density board, medium fiber board, particle board, wood, etc._x000D_ Suitable for square hole drills and square tenon machines_x000D_ Shank Type: Round shank 1OVERALL HEAT TREATMENT: The drill bit is made of alloy steel section, the overall heat treatment bring high hardness and long service life 2CONVENIENT FOR WOOD CHIPS DISCHARGE: U shaped long chip flute design is convenient for the discharge of wood chips and improves drilling efficiency 3AVOID BURSTING: The force of the cutting edge of the drill bit is on the same plane, and the effective protection can avoid the situation of bursting at the beginning of use, very stable 4USE WITH SQUARE HOLE DRILLS: The drill tail adopts a circular design, which makes the clamping more stable. Can be used with square hole drills and square tenon machines 5FOR WOOD PRODUCTS: Suitable for drilling wood products such as density board, medium fiber board, particle board, wood and so on1 xSquareHole Mortiser Drill Bit 1 x Drill core Please bring protective gear when drilling to prevent the debris from splashing and hurting yourself.