Jeu de forets à trous carrés, foret à bois à trous carrés, burin de perçage et de mortaisage à trous carrés

Material: High-speed steel; Hardness: HRC48-50, durable, highly practical, heat-treated for long service life. Available in 4 different sizes: 1/4" (6.35mm), 5/16" (7.94mm), 3/8" (9.5mm), 1/2" (12.7mm). Ideal for drilling square holes in wood using a mortising machine or mortising pliers. It requires a mortising machine. Manual drilling requires tools such as a hand drill and hammer. Standard chip removal design facilitates easy sawdust removal and improves drilling efficiency. Reduces the workload for construction workers, speeds up construction, and lowers construction costs in the building, installation, renovation, and decoration industries.