A 41 piece tap & hex die set for 17 popular machine screw and fractional sizes and all of the most commonly used machine screw sizes. Also includes tap wrenches, die stock, die holders, screwdriver, plus a set of thread gauges. Includes storage case with built-in tool tray. Sizes are: 4-40, 6-32, 8-32, 10-24, 10-32, 12-24, 1/4-20, 1/4-28, 5/16-18, 5/16-24, 3/8-16, 3/8-24, 7/16-14, 7/16-20, 1/2-13, 1/2-20, 1/8 NPT. #4-1/2 inch PLUS 1/8-inch Pipe and Thread Gauge.