"Lyman has taken a ""step up"" in loading block design with their new Bleacher Blocks. Just as bleachers allow people to see over those in front of them, their new loading blocks allow for easier handling of cases in and out of the loading block. Their stepped design allows you to easily grip a single case without jamming your fingers down into a group of cases like in traditional loading blocks and allows for a smaller ""footprint"" on your bench. Made of tough, durable polymer, the Bleacher Blocks are molded in three sizes to closely fit a variety of rifle cases. One size fits 223 size case heads, another fits 308 size case heads and the third fits belted magnum size cases. All hold 50 rounds."