The Lee Auto Prime Hand Priming Tool is a great tool for the hand loader wanting to prime each brass case by hand. The Lee Auto Prime utilizes special shell holders that will only fit the Auto Prime, they will not fit in a reloading press. There are twenty different shell holder sizes to suit the needs of all reloaders. Auto Prime Shell holder utilize the same number as Lee Universal Shell holders and will fit the same cartridges. Specifications: Fits: - .22 Remington Jet - .256 Winchester Magnum - .38 Smith & Wesson - .38 Colt New Police - .38 Short Colt - .38 Long Colt - .38 Special - .357 Magnum - .41 Long Colt