Amana Tool 55227 Carbide Tipped 82 Degree Countersink Set with Adjustable Drill Bit Depth Stop and No-Thrust Ball Bearing 3/8 Dia x 1/8 Drill Dia x 1/4 Inch Quick Release Hex Shank - Countersink Bits - Amazon.com
WIDIA GTD GT905064 Victory GT90 HP Tap, Plug Chamfer, Right Hand Cut, Left Hand Helix, 3 Flutes, 3/4-10, HSS-E-PM, Nitride/Oxide Coating: Amazon.com: Industrial & Scientific