This kit contains only the every day taps and dies used on most motor bikes. Why buy a large, expensive kit, when you probably will never use many of the taps or dies? Gone is the expensive box, instead taps and dies are preserved in their own individual plastic container. This makes storage in your toolbox drawer easy. Included: 14", 516", 38", 716" and 12" BSC - CEI bottom taps (26 TPI) Dies in the same sizes 2BA Tap and Die are included for carb and electrical components, as most times you only need a tap to clean out paint, or plating etc. Taper taps are used when making a new thread and are really unneccesary in a maintenance kit. However, if you need to cut a new thread from scratch, order the taper tap seperately. Also included is the often used 14"-19 BSP bottom tap for cleaning out those gas tank pet cock threads. This is a parallel thread.