The Lock-N-Load Comparator Body is a must-have tool for any serious shooter who wants to ensure their cartridges are loaded to the perfect headspace. This simple and compact tool allows you to easily measure your cartridge heads and adjust your dies accordingly. What makes the Lock-N-Load Comparator Body so effective is its versatility. It is compatible with any caliber, so no matter what ammunition you use, you can measure it with confidence. The tool is made with high-quality materials and is designed to last for years of reliable use. The tool is also incredibly easy to use. Simply attach your caliber-specific insert to the Comparator Body, insert your cartridge into the insert, and measure the headspace with your caliper. The readings are accurate and consistent, allowing you to easily adjust your dies to create perfect cartridges every time. Overall, the Lock-N-Load Comparator Body is an excellent tool that every shooter should have in their kit. It is reliable, accurate, versatile, and easy to use. It may be small, but it packs a powerful punch when it comes to ensuring you have perfectly loaded cartridges.