ATOPLEE Square Hole Drill Bit for Wood, 3pcs HSS Woodworking Square Mortise Drill Bit, Hole Diameter 5/16 inch (8mm), 3/8 inch (9.5mm), 1/2 inch (12.5mm) (all sizes)

"The square hole drill bit consists of a center drill and a sharp outer drill sleeve. It must be used with square hole drilling machines. With this drill bit (installed on a square hole drilling machine), you can drill a square hole faster than with a chisel or other manual methods, and the size of the square hole is more accurate. Sharp and efficient: The square hole drill bit is made of high-speed steel, the blade is sharp and wear-resistant, general heat treatment, high hardness, long service life, the drilling sleeve has a U-shaped design to facilitate the discharge of wood chips and improve drilling efficiency. Size: Holder diameter: 3/4 inch. Drill core length: 7.87 inches; Groove diameter: 5/16 inch, 3/8 inch, 1/2 inch. Total weight: approximately 161 g/190 g/240 g. Usage: This square hole drill bit is suitable for wood, including MDF, chipboard, pine, basswood, etc. Note: It is not suitable for processing metal, glass, plastic, concrete, drywall, etc. Package includes: 3 pieces of square hole drill bits, 5/16 inch, 3/8 inch, 1/2 inch."