Make it Snappy 3-Flute Flat Bottom Counterbore - TiN coated 3/8 Inch x 1 Inch

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

COMOWARE Step Drill Bit - Titanium Coated Total 10 Sizes from 1/4" to 1-3/8"

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

Amana Tool 55241 - Carbide Tipped 3/8 D X 7/64 Drill D X 1/4 Inch

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

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

Make it Snappy Countersink Bit - Alloy Steel 1 9/64 Inch x 1/2 Inch

Make It Snappy Tools 3-Flute Flat Bottom Counterbore - Tin Coated 3/8 Inch

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