Woodworking Square Drill Bits Set, HSS Wood Mortising Chisel Countersink Bits Woodworker Hole Saw Power Tool Kits 1/4, 5/16, 7/16, 1/2, 5/8-Inch, Set of 5

When you use these square drill bits, please make sure that the drill bit and the board are at a 90 degree angle to avoid the center drill bit from breaking How to instatll these square drill bits? 1, The drill core is very sharp.

Wear working gloves to avoid direct contact between your hands and the drill bit during installation.

2, 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 3, Take 0.5~1mm thick sheet (metal sheet or plastic sheet) and jam it at the step of the drill shell.

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 Features: Suitable for construction, installation, renovation, decoration industry, etc.

Ground and Hardened high speed steel for efficient performance and long life Apply for woodworking project,construction,installation,decoration industry Specification: Material: High Speed Steel(HSS) Hardness: Up to HRC48~50 Size: Square hole, 1/4"(6.4mm), 5/16"(8mm), 7/16"(11mm), 1/2"(12.7mm), 5/8"(16mm).

Corresponding shank, 7/40"(4.4mm), 2/9"(5.8mm), 10/31"(8.2mm), 3/8"(9.8mm), 3/8"(9.8mm).