Eazypower Isomax 3/8 In. Tool Steel Countersink Bit 1 Pc : Target
DEWALT 3-Piece Assorted High-speed Steel Countersink Twist Drill Bit Set in the Twist Drill Bits department at Lowes.com
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 -
Snappy Tools 1/8 Inch x 3/8 Inch Countersink #43008 - Amazon.com
Fuller 3/8 in. x 5/32 in. Drill Countersink
Countersink Taper Drill Bit - Amana Tool 55626, 3/8" x 1/8" Hex Shank