BEIJIYI 4pcs Square Hole Chisel Set, Square Hole Drill Bit, Woodworking Tool Set (1/4-1/2-5/16-3/8 inch)

Professional wood drill bit, suitable for construction, installation, renovation, decoration, etc. The workpiece forms a hole, which is drilled by the rotating body, while the effect of the impact force is transmitted to the outside The material creates a round hole and a square head at once, and the dust can be discharged through the pipe. Professional design, ideal for drilling square holes in wood with a chisel. Suitable for all machines and drill attachments. Square hole drills are mainly used in woodworking. Material and size: Made of high speed steel. Heat treatment, HRC48~50, high hardness, extended center, high concentricity; 4 sizes: 1/4 inch (6.35 mm), 5/16 inch (7.94 mm), 3/8 inch (9.5 mm), 1/2 inch (12.7 mm). Reduces the labor intensity of construction workers while accelerating the work speed and reducing costs. Perfect for construction, renovation and decoration. 1 piece 1/4" (6.35 mm), 1 piece 5/16" (7.94 mm), 1 piece 3/8" (9.5 mm), 1 piece 1/2" (12.7 mm)