Features Woodworking tool square hole drill bit. Thanks to the general heat treatment, it has a high hardness and a long service life. U-shaped flutes facilitate the removal of wood chips and improve drilling performance. The force lies in a plane that is effectively protected and can avoid the bursting situation at the beginning. Universal shank type, the drill tail has a round design that makes the clamping more stable. Wide application, suitable for square hole drills and square tang machines. Specification:Condition:100% Brand New Item type: square hole drill. Material: steel bearings. Colour: as shown in the picture. Use: suitable for wood products such as density boards, medium fibreboard, chipboard, wood, etc., suitable for square hole drill and square tapping machines Specification: 1/4, 5/16, 3/8, 1/2specificity hole. Size shank. Groove diameter: Depth Total. Length: 1/46.4 mm. 0.3 in 4.1 mm/0.2 in. 45 mm. 1.8 in 170 mm/6.7 inches. 5/168 mm. 0.3 in 5.5 mm/0.2 in. 60 mm. 2.4 in 200 mm / 7.9 inches. 3/89.5 mm. 0.4 in 6.5 mm/0.3 in. 60 mm. 2.4 in 210 mm/8.3 in. 1/212.7 mm. 0.5 in 8.5 mm/0.3 in. 60 mm. 2.4 in 210 mm/8.3 in. Package list: 4 x square hole drills. Note: Cannot be used on metal, concrete, glass and plasterboard. Package List 4 x Square Hole Drill Bits