Designed to shave small amounts of brass from the outside of the case neck to created a consistent neck thickness. The cutter uses caliber specific pilot (sold separately) to guide the case neck. It can be zeroed to the pilot then adjusted in .0005″ increments with the micrometer dial to the desired case neck thickness. The Quick Change Case Holder features an ergonomic design that allows you to rotate the case and put forward pressure to feed the case neck to the cutter, and the quick case change feature helps to speed up the process without having to use small obtrusive thumbscrews. For right or left handed use.