Vermont American 20176 High Carbon Steel NC Fractional Taper Tap - 1/2-inch by 13 High carbon steel fractional taper taps are ideal for cutting right-hand internal threads Taper taps have 8 to 10 threads chamfered for easy starts in tough materials. Four flute design on all taps ensures fast and easy chip clearance. Required drill size is permanently etched on the tool for quick and easy reference.