The Redding #1 Competition Shellholder Set is a precision 5-piece shellholder kit designed for advanced reloaders who need precise headspace control for competition-grade ammunition.Redding #1 Competition Shellholder Set (SKU: RDNG-11601)Five shellholders with incremental thickness: +0.002" +0.004" +0.006" +0.008" and +0.010"Each shellholder is 0.125" from case head cut to topBlack oxide finish to distinguish from standard shellholdersClearly marked thickness on each shellholderIncludes 6-position storage box with space for regular shellholderEssential for competitive shooters and precision reloaders who require exact headspace adjustment for optimal accuracy and brass life. The varying thicknesses allow fine-tuning of cartridge headspace to match specific chamber dimensions.