RCBS Stainless Steel Dial Calipers are made from stainless steel to ensure a lifetime of heavy-duty performance and come with a hard protective storage case as well. These calibers have a range of 0 to 6 inches, and they are guaranteed accurate within 0.001 inches. These RCBS Stainless Steel Dial Calipers are so well-made that they will provide accurate readings long after your favorite reloading dies wear out. These calipers offer serious reloaders like you a fast and easy way to measure your cartridge case lengths as well as primer pocket diameters.