Reloaders who insist on the ultimate in feeding reliability turn to Lee carbide undersize sizing dies. Sizing the brass between .002" and .003" smaller than other Lee sizing dies, this die produces brass cases that will chamber each and every time as it is stripped off the magazine. The die also serves to increase and provide more consistent neck tension on loaded bullets, improving accuracy. These carbide dies will not leave a belt mark on the case. Lubricant while sizing with carbide dies is not required, but a little bit of case lube will make the process easier. Shell holder not included.