Square Hole Mortise Chisel Drill Bit Tools, Woodworking Hole Saw Mortising Chisel Drill Bit Set Twist Drill, Different Sizes 1/4" 5/16" 3/8" 1/2" (4pcs) -

Description -Size: 6.35mm (1/4"), 7.94mm (5/16"), 9.5mm (3/8"), 12.7(1/2")mm-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 about 210mm, belong to longer drilling core.-Material: Made of high speed steel, through heat processing, with high hardness drill bits, and sharp-edged square chisel, long lifeApplication: Used for woodworking punchingHigh working efficiencyWith 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.Package Includes:1 X 6.35mm (1/4") Twist Drill1 X 7.94mm (5/16") Twist Drill1 X 9.5mm (3/8") Twist Drill1 X 12.7mm (1/2") Twist Drill