The Lyman Anodized Aluminum Loading Block features a .388 hole size, designed specifically for small rifles. Crafted from high-quality 6061-T6 aluminum, this precision loading block is CNC milled to tight tolerances, ensuring a secure fit for your cartridges. Unlike standard plastic blocks, this loading block accommodates 50 rounds and includes stick-on rubber non-slip feet for stability during use. Perfect for reloaders seeking quality and precision in their reloading process, it fits popular cartridges like 17 Rem, 204 Ruger, and 223 Rem.