Set of 4 square hole chisels, 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, high hardness, elongated center, high concentricity; 4 sizes: 1/4" (6.4mm), 5/16" (8mm), 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 piece 1/4" (6.4mm), 1 piece 5/16" (8mm), 1 piece 3/8" (9.5mm), 1 piece 1/2" (12.7mm). Note: Drilling the square drive requires a drill, hammer, or other tools. (None of these items are included.) Note: All measurements are taken manually; please allow for a 1-3cm error. Due to differences in lighting and display settings, there may be some color variation; the actual product received will prevail.