Handdo 7Pcs Square Hole Drill Bit, High Speed Steel Sharp Durable Mortising Chisel Set 6/25, 1/4, 5/16, 3/8, 2/5, 1/2, 9/16 Inch

<p>7Pcs Square Hole Drill Bit <br>Material: HSS<br>Hardness: HRC 48~50<br>Slotting flute diameter: 6/25 inches (6 mm), 1/4 inches (6.4 mm), 5/16 inches (8 mm), 3/8 inches (9.5 mm), 2/5 inches (10 mm), 1/2 inches (12.7 mm), 9/16 inches (14 mm)<br><br>Using steps:<br>1. Drag the core and shell into the equipment fixture and drag.<br>2. Take a 0.5 - 1 mm thick sheet (metal sheet or hard plastic sheet) stuck at the step of the drill shell.<br>3. After fixing the drill core, take down the slice, and then adjust the angle of the drill shell and press it upward and clamp it (the purpose is to form a 0.5 - 1 mm gap between the head of the drill core and the inner angle of the drill shell to avoid the bit stuck dead).<br><br>Notice: <br>Square hole drill needs to cooperate with square hole drill machine (mortise and tenon) use and can not use with hand-operated electric drill<br><br>Package Included:<br>1 X 6/25 Inch (6.0mm) Drill Bit<br>1 X 1/4 Inch (6.4mm) Drill Bit<br>1 X 5/16 Inch (8.0mm) Drill Bit<br>1 X 3/8 Inch (9.5mm) Drill Bit<br>1 X 2/5 Inch (10mm) Drill Bit<br>1 X 1/2 Inch (12.7mm) Drill Bit<br>1 X 9/16 Inch (14mm) Drill Bit</p>

• 7 Sizes: Round handle, 6/25 inch(6 mm), 1/4 inch(6.4 mm), 5/16 inch(8 mm), 3/8 inch(9.5 mm), 2/5 inch(10 mm), 1/2 inch(12.7 mm), 9/16 inch(14 mm)
• Material: Square hole drill is made of HSS, after heat treatment, the drill has high hardness and is not easy to break
• Easy to use: Our wood-working grind bit kit is suitable for hole opening square and keyhole drills
• Widely used: Mortise drill is suitable for mortise machine or mortise fittings, which can improve the working efficiency of wood-working
• Package includes: 7 x Square hole drill bits