NUZAMAS HSS Mortising Chisel Set, 4 Pieces Set Woodworking Square Drill Bits Wood Hole Saw with Twist Drill (1/4\
- Set of 4 Square Hole Drill Bits Mortising Chisel Set, 1/4" (6.35mm), 5/16" (7.94mm), 3/8" (9.5mm), 1/2" (12.7mm), extra-long Drilling core –over 210mm.
- Made of high-speed steel. Heat treatment, HRC48~50, high hardness, lengthened core, high concentricity..
- Great for drilling square holes in wood with a mortising machine or a mortising attachment..
- Fits all mortising machines and drill press attachments. Square hole drill is mainly used for woodworking aspects..
- Professional wood drill bit, suitable for construction, installation, renovation, decoration industry, etc..