Make It Snappy Tools Flat Bottom Counterbore - 3/16 Inch

woobles Dry Diamond Drill Bits - Diamond 5 PCs 1/4, 5/16, 3/8, 1/2 inch

Neiko 10047A - M2 HSS Steel 5-Piece 1/8, 3/16, 1/4, 5/16, and 3/8-Inch

WSOOX Square Hole Drill Bits - carbide 1/4 inch 5/16 inch 3/8 inch 1/2 inch

STROTON 5% Cobalt Drill Bit Set - 5% Cobalt 21PCS 1/16-3/8 Inch

Make it Snappy 3-Flute Flat Bottom Counterbore - 7/16 Inch

COMOWARE Stubby Drill Bit Set - HSS M2 5pcs 3/32" 1/8" 3/16" 1/4" 5/16"

Make it Snappy Flat Bottom Counterbore - Tin Coated 5/16 Inch

IRWIN TOOLS 62112ZR - Black Oxide High-Speed Steel Single 3/16" x 12"

Neiko 11402A - M2 High Speed Steel 5 Piece 3/32 1/8 3/16 1/4 5/16-inch

CMT ORANGE TOOLS 537.190.31 - special alloyed steel 3/4-Inch