Disston E0106166 Carded Blu-Mol Drill/Countersink Set, 4-Piece For drilling, countersinking and counter boring in one operation Can be used on wood or composition material Twist drill adjusts to any screw length Set contains (1) of the following drill/countersinks: #6 Woodscrews, #8 Woodscrews, #10 Woodscrews & #12 Woodscrews