Feature

●Material: These square hole drill bits made of high speed steel, through heat processing, with high hardness drill bits, and sharp-edged square chisel, long life using
●High working efficiency: Woodworking drill bit sets with long drill core and square chisel, easy to lock the hole on the wood, then you can get different mortisers quickly. Also, it is labor saving.
●Size: Come with 5 different size for your choose. 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). More details please check the second picture and it is more intuitive. These long square drill bits set can meet most of your needs, and each drills packed in a single plastic case, easy to maintain.
●Available application: These woodworking morstising chisel bits set are suitable for drilling square holes in wood with a mortising machine or a mortising attachment. Also, it fit for bench drilling machine. ATTENTION: These square drill bits are not fit for any hand drill. Please make sure that the wood borad and the drill are at a 90 degree angle. (Also we describled installation step in below product description.)
●Warranty: We guarantee provide you satisfied service, if there is any quality problem, you can just contact us, we can send you a new one or refund you the full payment


Description

Attention: 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). More details please check the second picture and it is more intuitive.
Shape of hole: square, rectangle
Suitable for bench drilling machine, mortising machine or a mortising attachment, But not for any hand drill
Package included:
5Pcs woodworking chisel drill bits