Top-adjusting dies save time and aggravation by eliminating the need to remove the die from the press in order to adjust the bullet crimp - perfect for high-volume, progressive reloaders. Knurled micrometer-type barrel gives you approximately ± .100" adjustment after the initial setup. No more guessing if your crimp is at the right place or having to loosen everything up to guess again. Innovative internal sleeve of hardened steel forms the crimp. Sleeve is double-ended, with a specific taper at each end, so it can be flipped around to crimp a second, related-size cartridge.