Manufactured from alloy tool steel and coated with a protective black oxide layer, these tap sockets provide increased hardness, durability and resistance. Equipped with a vinyl holder for storage, they are easy to place and difficult to lose the sockets 70500 tap socket set fits most common tap sizes, not only fits all number and fractional M. C. T. I. standard taps thru 1/2". Also fits 1/8" NPT taps and metric taps thru 12mm manufactured to M. C. T. I. standards for a wide range of applications Ideal for restricted areas and areas where a t-handle not fit, each drive tap socket adapter has a square that closely matches the size of the tap, insert the tap into the socket until the square end is fully engaged 70520 socket #1, 70540 socket #2, 70560 socket #3, 70580 socket #4, 70600 socket #5, 70620 socket #6, 70640 socket #7, 70660 socket #8, a tap holder, Weight: 0.92373687778 pounds, Manufacturer: Prterver