Features: The 7Pcs Square Hole Mortise Chisel Drill Bit Set features accuracy ground steel construction and 7 size options (1/4in to 5/8in) for creating clean, square holes in woodworking projects with unmatched durability. Heat treated carbon steel bits with piercing chisel edges ensure reduced friction and extended tool life, while the included storage box keep your woodworking hole saw kit organized and portable. Ideal for professional carpenters, furniture makers, and DIY enthusiasts requiring reliable mortising tool for cabinetry, door locks, or joinery work. Perfect for drilling precise square holes in hardwood, softwood, or composite materials when paired with mortising machines or drill press attachments. This complete square drill bits kit combines industrial grade materials with exacting size accuracy (6.4mm 16mm sizes) for seamless compatibility with standard woodworking power tool. Specifications: Material: Carbon Steel Package Includes: 7Pcs Square Hole Mortise Chisel Drill Bit Set note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.