Makes every die a custom die! Now you can control headspace. The new Redding Competition Shell holders are packaged in five piece sets in .002 increments (+.002, +.004. +.006, +.008 and +.010). Each shell holder has a distinct black oxide finish and is clearly marked to indicate the amount it will decrease case-to-chamber headspace. You can now easily adjust the shoulder bump to customize cases to your specific chamber. (5 Piece Set includes Shell holder box).