5/16″-18 threads per inch NC UNC 2 Flute High Speed Steel
Spiral Pointed Plug Tap.
H-3 Ground Thread Limit. 0.3125″ 5/16″ Drill Size
Super Fast Free-cutting for use in long through-holes
and in blind holes with chip clearance.
Taps are used for general and machine operations.
(PER BOX of 12)