4pcs Woodworking Square Drill Bits Set, HSS Wood Mortising Chisel Countersink Woodworker Hole Saw Power Tool Kits 1/2 1/4 5/16 3/8 Inch

Widely Used - Great for drilling square holes in wood with a mortising machine or a mortising attachment. Easy to Use - It will get double effect by matched use with mortise and tenon machine.The square hole punching needs to use electric drill, hammer or other tools. Save time - these woodworking morstising chisel bits can reduce labor intensity of construction workers, speed up the construction speed, reduce construction costs for construction, installation, renovation, decoration industrie Drills precise holes with little pressure -- Using different specifications of the square hole drill, matching the appropriate power of the square hole machine, you can play a square hole to meet the requirements - 1/2-Inch(12.7mm), 1/4-Inch(6.4mm), 3/8-Inch(9.5mm) , 5/16-Inch(7.94mm) High quality - 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, Manufacturer: Sciencey