JINYI [Specifications] Fits all mortising machines and drill press attachments. Square hole drill is mainly used for woodworking aspects. [Parameters] Clamping shank diameter: 19mm, shank type: round handle, slot diameter: 1/4 inches (6.35mm), 5/16 inches (8mm), 3/8 inches (9.5mm), 1/2 inches (12.7mm), 9/16 inches (14mm), 5/8 inches (16mm). [Wide application] Professional drill bit, suitable for construction, installation, renovation, decoration industry, etc. [Material] Made of high-speed steel. Heat treatment. HRC48 - 50. Offers high hardness, lengthened core, and high concentricity. Size: as shown Color: silver Scope of delivery: 7x, square hole drill Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin