Cut or repair 3/8-16 NC (National Coarse) internal threads in steel, aluminum, brass, or cast iron with this DeWalt 2-piece drill and tap set. The matched 5/16" black-oxide split-point bit and high-carbon-steel tap come together so the hole and thread sizes are correctly paired - no looking up tap-drill charts, just drill and tap.

• High-carbon-steel tap cuts precise threads in mild steel, aluminum, brass, and cast iron
• Matched 5/16" black-oxide split-point drill bit included - sized for the tap
• Patented tap core diameter is engineered to reduce breakage under torque
• Split-point drill tip starts on contact without walking - no center punch needed
• Black-oxide finish on the drill bit improves wear resistance and chip flow
• Tap size: 3/8-16 NC
• Drill bit size: 5/16"
• Use the tap by hand in a T-handle tap wrench, or chuck it in a tap holder for power tapping

Application Tip: 3/8-16 NC is the standard medium-heavy thread - engine mounting, frame work, larger brackets, structural light hardware. The matched 5/16" drill (0.3125") leaves correct stock for a strong tapped thread that resists pull-out under load.

Tapping Tip: Drill the hole at slow-to-medium drill speed using cutting oil for steel (or kerosene for aluminum). Then tap by hand or at very low RPM: turn the tap forward one full revolution, then back a quarter to half turn to break the chip - that's how you avoid binding and broken taps. Keep the tap perpendicular to the workpiece on the first few turns to get the thread started square.

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• ⚠  WARNING: Some dust created by power sanding sawing grinding drilling and other construction activities contains chemicals known to the State of California to cause cancer birth defects or other reproductive harm.