ORXPLUS Tools 5 Flute Metal Countersink Drill Bit, 87 Degree Quick Release Shank Fits for 1/8"-3/4"(3mm-19mm) - - Amazon.com
New Avanti PMAPC1040 Avanti Pro Drill Bit, 1/4 in Dia, 6 in Oal, Percussion, 2-Flute, 10 Mm Dia Shank, Straight Shank,Each - Walmart.com
WEN Tri-Flute Versatile Steel Auger Drill Bit Set with Carrying Case (6-Piece) DB613A - The Home Depot
COUNTERSINK DRILL BIT SET FOR METAL - 5 PC HIGH SPEED STEEL WITH 5% COBALT HSS-Co M35 GRADE, SIZES 1/4", 3/8", 1/2", 5/8" & 3/4" - 5 FLUTES w/ 82 DEGREE -
ORXPLUS Tools 5 Flute Metal Countersink Drill Bit, 87 Degree Quick Release Shank Fits for 1/8"-3/4"(3mm-19mm) - - Amazon.com