Set of 4 chisels, square hole drill bits, hollow steel chisels, woodworking 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 bits and attachments. The square hole drill bit is primarily used in woodworking.

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).

Why Choose This Item: Reduces the workload for construction workers while speeding up work and reducing costs.

Perfect for the building, renovation, and decoration sectors. Package contents: 1 x 1/4" (6.35mm), 1 x 5/16" (7.94mm), 1 x 3/8" (9.5mm), 1 x 1/2" (12.7mm) Note: Drilling the square drive requires a drill, hammer, or other tools. (None of these are included.)