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•4 PCS SET: A total of 4 drill bits with specifications of Size: (6mm) (8mm) (10mm) (12mm) for your use to meet different needs.•HSS MATERIAL: Made from high speed steel material, heat treated, these square drill bits have high hardness and long service life.•WIDELY USED: Square drill bits are very suitable for drilling square holes in wood with mortise machine or mortise accessories.•SHARPLY CHISEL: These drill bits are equipped with sharply square chisels to improve your work efficiency.•PRECISE SIZE: These square hole drill bits are fine made, with precise size, could perfectly match with the electric machine.Package includes:2. Excellent quality, made of alloy steel material, not easy to be damaged.3. Contains a heavy-duty positioning center punch tool, which is easy to mark.Notice: It needs to be used with bench drill, or hand drill larger than 800W or lithium drill larger than 48V.Package:1x 6mm Mortising Chisel Drill Bit1x 8mm (5/16 inch) Mortising Chisel Drill Bit1x 10mm Mortising Chisel Drill Bit1x 12mm Mortising Chisel Drill Bit1x Heavy positioning center punch