The Redding Competition Shell Holder Set gives you the ability to have complete control over headspace, and each set comes with five Redding Competition shell holders. These shell holders are sized in 0.002-inch increments, and each one is clearly marked to tell you the amount by which it will decrease case-to-chamber headspace. The Redding Competition Shell Holder Set comes in a heavy-duty plastic storage box to keep your shell holders in one place when they are not in use. This ensures that you can find your shell holders when you need them.