Piece Chisel Set Square Hole Drill Bits, Steel Hollow Chisel Carpentry Tools Set (1/4-1/2-5/16-3/8 Inch)

Professional design ideal for drilling square holes in wood with a mortiser. Fits all drill machines and attachments. The square hole drill bit is mainly used in the woodworking field. Material and size: Made of high speed steel. Heat treatment, HRC48~ 50, high hardness, elongated center, high concentricity; 4 sizes 1/4" (6.35mm), 5/16" (7.94mm), 3/8" (9.5mm), 1/2" (12.7mm). Why choose this item: Reduces the labor intensity of construction workers while accelerating the speed of work and reducing costs. Perfect for the construction, renovation and decoration sectors. Scope of delivery: 1 piece 1/4" (6.35mm), 1 piece 5/16" (7.94mm) , 1 piece 3/8" (9.5mm), 1 piece 1/2" (12.7mm), Note: Punch square need to use drill, hammer or other tools . (None of these are included). Features: 1. Professional wood drill bit, suitable for construction, installation, renovation, decoration, etc. 2. The workpiece forms a hole drilled by the rotating body, while the impact of the use of percussion force is transmitted to the outside of the body, the material creates a round hole and a head square, in one go, and the dust can be discharged through the tube. 3. The dimension is the length of the square hole drilled. 4. The cylinder diameter of the clamping portion is 19mm. 5. Drill hole center is over 210mm, for longer drill centers. Specifications: Sizes: 1/4" (6.35mm), 5/ 16" (7.94mm), 3/8" (9.5mm), 1/2" (12.7mm). Materials: High Speed Steel. Hobby Supplies : Woodworking. Use: Wood drilling/perforating. Package contents: 1 1/4" or 6 drill bit, 35mm. 1 drill bit of 5/16" or 7.94mm. 1 drill bit of 3/8" or 9.5mm. 1 drill bit of 1/2" or 12.7mm. Note: Since hand measurement, sizes shown may vary by 1-3cm. Depending on the brightness and light settings of the monitors, the color of the actual item may be slightly different from the pictures. Thank you for your understanding.