Product size: 1/4inch(6.35mm), 5/16inch(7.94mm), 3/8inch(9.5mm), 1/2inch(12.7mm)
1/4inch(6.35mm), 5/16inch(7.94mm), 3/8inch(9.5mm), 1/2inch(12.7mm)
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 we sell are more than 210mm, belong to longer drilling core.
Application: used for woodworking punching
Please allow 1-3cm differs due to manual measurement.
1 X 1/4 Inch Twist Drill
1 X 5/16 Inch Twist Drill
1 X 3/8 Inch Twist Drill
1 X 1/2 Inch Twist Drill
Material: High-speed steel
The whole heat treatment, HRC48-50, high hardness.
Drilling core is lengthened, concentricity is high.
Used with mortising chisel , if extend square hole manually, need to use electric drill, hammer and other tools.
A set of 4 specifications .