The bushings, intended for use with the Lock-N-Load headspace gauge, are machined to precise tolerances to guarantee consistent and reliable results with each use. The Lock-N-Load headspace gauge enables reloaders to accurately measure cases during sizing, ensuring an optimal fit in any firearm. Designed for compatibility with the Hornady headspace comparator Enhance brass longevity, improve accuracy and increase safety All bushings are interchangeable with the comparator