Tap Sizes: 1/4" X 18 NPT, 3/8" X 18 NPT, 1/2" X 14 NPT. Dies Sizes: 1/4" X 18 NPT, 3/8" X 18 NPT, 1/2" X 14 NPT. 6pc Tap and Dies Set. If you feel our S&H prices are too high, we can provide you weight the item's weight so that you can confirm the prices for yourself.