ATOPLEE Square Hole Drill Bit Set,3pcs HSS Woodworking Hole Saw Mortising Chisel Drill Bit Tools,5/16 3/8 1/2 Inch (All of Sizes)

Generally, square hole drills need to be used with square hole drilling machines (square tenoning machines).
Using square hole drill bit (installed on a square tenon machine) to make a square hole is faster than using a chisel or other manual methods, and the size of the square hole is more accurate.
Material: HSS
Size: inch
Type D(Hole diameter) D1(Handle diameter) D2(Clamping diameter) B(Grooving depth) L(Total length)
5/16 5/16 approx 1/4 3/4 approx 2 approx 8-1/2
3/8 3/8 approx 5/16 3/4 approx 2 approx 8-9/16
1/2 1/2 approx 3/8 3/4 approx 2-3/4 approx 8-1/4
Note: The size of the clamping drill sleeve of the square tenoning machine needs to be greater than 19mm (3/4 inch)
Use note:
1.In normal use, don't try to shape it at one time, but need to press and lift multiple times. This will not only help the drill bit to discharge the sawdust, drill a suitable square hole, but also protect the drill bit.
2.When using continuously for a long time, pay attention to cooling the drill bit.
3.It should be specially pointed out that: We strongly do not recommend using hand drills or ordinary drill stands (non-square tenoning machines) to match this drill bit to make square holes.