3/5/6pcs HSS Step Drill Bit Set Cone Hole Cutter

Specification:  Material:HSS 4241;  Surface:Baking yellow;  Quantity:3/5/6pcs;     Features:  Unique ladder structure, round shank. Straight grooves.  Two-flute design gives you faster and smoother cutting.  For cooler running and can effectively extend the service life of the drill bit.  Suitable for carbon steel plate, sheet iron, steel plate, insulation boards, wood. Cannot be used for stainless steel. Suitable for the workpiece 25° or less.     Package Included:  3 x Step Drill Bits;  Or 5 x Step Drill Bits+1x Storage Case;  Or 6 x Step Drill Bits+1x Storage Case