LEONTOOL 6Pcs Square Hole Drill Bits for Wood Square Hole Mortise Chisel Drill Bit Tools, 1/4" 5/16" 3/8" 1/2" 9/16" 5/8" Woodworking Hole Saw Mortising Chisel Drill Bit Set for Mortising Machines - 14GD1695-FBA

• Application: This square hole drill bits are mainly used to make square or rectangular slots. Suitable for wood, including MDF, MDF, particle board, channel wood, pine wood, basswood, etc. Note: It is not suitable for processing metal, glass, plastic, concrete, gypsum board etc. Easy to Drill: The carbide drill bit tipped is sharp and wear-resistant. With high hardness and long service life. The drill sleeve has a U-shaped design to facilitate the discharge of wood chips and improve the drilling efficiency. Material: Made of 45# steel with high strength. The surface is polished, durable and not easy to corrode. Drill Bits Sizes: Drill bits diameters: 1/4 Inch (6.4mm), 5/16 Inch (8mm), 3/8 Inch (9.5mm), 1/2 Inch (12.7mm), 9/16 Inch(14mm), 5/8 Inch(16mm). Note: Square hole drills need to be used with square hole drilling machines (square tenoning machines). The square hole drill bit is composed of a center drill core bit and a sharp outer drill sleeve. Using this drill bit (installed on a square tenon machine) to make a square hole is faster than using a chisel or other manual methods, and the size of the square hole is more accurate.