HSS Twist Drill Bits Square Auger Mortising Chisel Drill Set Square Hole Woodworking Drill Tools Kit 4Pcs Set

Description:
✔This Mortising Chisel is great for drilling square holes in wood with a mortising machine，mainly used for woodworking aspects
✔Finished with fine polishment, these square drill bits come with no burrs to provide a smooth drilling experience
✔These square drill bits are Standard chip groove design, widening row dust and smooth inner wall bring larger wood crumbs amount of chip removal. It could help you work quickly and efficiently

Specification:
Material: high-speed steel
Slotting Flute Diameter:1/4 Inch (6.4mm), 5/16 Inch (8mm), 3/8 Inch (9.5mm),1/2 Inch (12.7mm)
Package Included:
4PCS Square Hole Drill Bits

How to instatll these square drill bits?

1.Put the square drill shell and drill core into the jig of the square tenoning machine, and then hold the square hole drill bit by hand
2.Take a 0.5 - 1 mm thick sheet (metal sheet or hard plastic sheet) stuck at the step of the drill shell
3.After fixing the drill core, remove the sheet, then adjust the angle of the drill shell to the top to ensure clamping, so that a 0.5~1mm gap can be formed between the drill core head and the inner bevel of the drill shell, which can prevent the bit from jamming during use

Note:
1.The drill core is very sharp, and please wear working gloves to avoid direct contact between your hands and the drill bit during installation
2.the square hole drill can not be used on an electric drill, bench drill. Drill square holes need to fit a square hole drill drilling (mortise and tenon machine) to use