Set of 4 square hole chisels, square hole drill, woodworking tool set (1/4-1/2-5/16-3/8 inch)

Professional wood drill bit, suitable for construction, installation, renovation, decoration, etc.

The bit forms a hole drilled by the rotating body, while the impact force is transmitted outward from the body.

The material is created with a round hole and a square head in one pass, and the dust can be expelled through the tube.

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 treated, 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). Reduces the workload for construction workers while speeding up work and reducing costs. Perfect for the building, renovation, and decorating industries. 1 piece 1/4" (6.35mm), 1 piece 5/16" (7.94mm), 1 piece 3/8" (9.5mm), 1 piece 1/2" (12.7mm)