Set of 4 square hole chisels 1/4" to 1/2" – High-speed steel – For precise drilling in hardwood – Compatible with mortisers

General Description: Professional design ideal for drilling square holes in wood with a mortiser. Fits all drills and attachments. The square hole drill bit is primarily used in woodworking. Technical Specifications: Material: High-speed steel; Heat treatment: HRC48~50; High hardness and high concentricity; Available sizes: 1/4" (6.35mm), 5/16" (7.94mm), 3/8" (9.5mm), 1/2" (12.7mm); Compatibility and Accessories: Fits all drills and mortisers; Installation: Use a drill, hammer, or other compatible tools to install the square hole drill bit (none of these tools are included). Use: Reduces the workload for construction workers while speeding up work and reducing costs. Perfect for the building, renovation, and decorating industries. Other information: Package contents: 1 piece 1/4" (6.35mm), 1 piece 5/16" (7.94mm), 1 piece 3/8" (9.5mm), 1 piece 1/2" (12.7mm).