Features Seiko Design: U-shaped long chip flute design, easy to discharge wood chips, improve drilling efficiency, universal handle shape, round design of drill tail, more stable clamping. Wide Range of Application: This square hole drill bit is suitable for MDF, MDF, particleboard, wood and other wood products, suitable for square hole drilling, square tenoning machine. Bearing Steel Forging: This drill is forged with bearing steel, with overall heat treatment, high hardness, long service life, and more secure use. Not Easy to Burst: The drill sleeve design, the drill sleeve blade is stressed on the same plane, effectively protects it from bursting in the initial use. Excellent After-sales Service: We provide you with high-quality after-sales service. If you have any questions, please feel free to contact us, and we will deal with it for you as soon as possible. Specification: Condition: 100% Brand New Item Type: Square Hole Drill Bit Material: Bearing Steel Model: 6mm/0.2in / 8mm/0.3in / 9.5mm/0.4in / 10mm/0.4in Application: Suitable for wood products such as density board, MDF, particle board, wood, etc., suitable for Square hole drills, Square tenon machines  Specification Square Hole SizeHandle Diameter Grooving Depth Total Length  Weight 1/4(6mm) 6mm / 0.2in 4mm / 0.2in 45mm / 1.8in 175mm / 6.9in 120g / 4.2oz 5/16(8mm) 8mm / 0.3in 5.5mm / 0.2in 60mm / 2.4in 195mm / 7.7in 160g / 5.6oz 3/8(9.5mm) 9.5mm / 0.4in 6.5mm / 0.3in 60mm / 2.4in 195mm / 7.7in 170g / 6oz7/16(10mm) 11mm / 0.4in 8mm / 0.3in 60mm / 2.4in 195mm / 7.7in210g / 7.4oz  Package List: 1 x 6mm Square Hole Drill Bit 1 x 8mm Square Hole Drill Bit 1 x 9.5mm Square Hole Drill Bit 1 x 10mm Square Hole Drill Bit Note: 1. Please allow slight error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. Package List 1 x 6mm Square Hole Drill Bit 1 x 8mm Square Hole Drill Bit 1 x 9.5mm Square Hole Drill Bit 1 x 10mm Square Hole Drill Bit