Short Action Customs Universal Neck Sizing bushings are compatible with common neck sizing dies. Universal outside dimensions of 0.500" diaameter by 0.375" in height, these bushings can be used in most resizing dies. Short Action Customs neck resizing bushings have minimized neck runout in cartridge brass in nearly every die they have used them in. After attempting to eliminate and reduce neck runout in sized brass using various commercially available neck bushings, they realized that every neck bushing has the same flaw; a straight, undersized hole when compared to the brass. Their new bushings address the inherent flaws with this system with all new internal bushing geo Mfg: Short Action Customs, Llc.