Reloading ammunition requires attention to many critical cartridge dimensions, including case length, overall length, primer pocket depth, neck and base diameters etc. Verifying these dimensions is quick and convenient, with the Frankford Arsenal Calipers and Micrometers. The calipers are accurate within .001 inch, and the Micrometers are accurate within .0001 inch. The calipers allow you to measure inside and outside diameters, plus depths. You will find them useful for many measuring tasks, on and off the reloading bench.