Viking Drill and Tool 58010 SP-18TDF Type 20-UB Spiral Point Plug Style Magnum Super Premium Tap/Drill Set 18 pc. Taps and Drills Set Premium High Speed Steel Spiral Point, NF Spiral Point NF Tap & Drill Set Contains: #33, 29, 25,21, 3, 1,Q, 25/64, 29/64, 6-40, 8-36, 10-24, 10-32, 1/4-28, 5/16-24, 3/8-24, 7/16-20, 1/2-20 Set includes tap and corresponding drill bit Spiral Point Gold Oxide Plug Style