RCBS Universal Press Type Shell Holder #10 (17 Remington, 204 Ruger, 223 Remington)

RCBS Universal shell holders are produced from hardened steel and designed to properly align the case with the reloading die in single-stage and turret presses. They’re sized to fit specific case heads and capture 0.125 inch of the case head for proper SAAMI headspace.

And they are numbered for easy identification.