HSS Twist Drill Bit Square Auger Mortising Chisel

Drill Core and Square Hole Woodworking Drill Kit Set.

Material: High-Speed Steel


Application: used for woodworking punching
Heat treatment, HRC48-50, high hardness.
Drilling core is lengthened, concentricity is high.
Use with mortising chisel, if extend square hole manually, need to use electric drill, hammer and other tools.
The dimension refers to the length of the square hole drilled by the square hole.
The cylinder diameter of the clamped portion is 19mm/0.74inch.
The square hole drilling core are more than 210mm, belong to longer drilling core.

 Choose Either

4pc Set: 6.4mm, 8mm, 9.5mm and 12.7mm.

7pc Set: 6.4mm, 8mm, 9.5mm, 10mm, 12.7mm, 14mm and 16mm.