[Good Quality Material]: Good quality hardware components, high speed steel and carbon steel, durability, high toughness, wear resistance and good cutting edge retention. [Shank]: Comes with 1/4 " hex shank, can be used with power drills and quick change chucks. [Five edge chamfer design]: This design will quickly discharge chips from the hole on both sides, perfect for wood, carbon steel, sheet metal, insulation plate, plastic, PVC, etc. [Easy to use]: 1.Turn the hex key to adjust the necessary length. Insert the countersink bit into the drill. 3.Please drill the bit vertically during the operation. Color: Gold D'or Functionality: & nbsp; Standard 1/4 inch hex shank is quick change compatible. Counter-shaft depth adjustable with Allen key. & nbsp; Specially designed steel backstrip cutters or counterboring pilot hole. & nbsp; High speed heat treated steel, hardened and durable for superior cutting power. & nbsp; Faster evacuation of sawdust, you will get a nice smooth surface on any type of hardwood, soft or aluminum. & nbsp; Suitable for soft metal, insulation boards, PVC panels, wood panels, etc.