The Lyman Custom Fit Loading Block with 0.388" diameter holes is designed to provide a precise fit for multiple cartridge families. Made from tough durable polymer this loading block holds 50 cartridges and features a stackable design for easy storage.Lyman Custom Fit Loading Block with 0.388" holes50-cartridge capacity with secure fitDurable polymer constructionCompatible with .17 Hornet .17 Rem .204 Ruger .22 Hornet .222 Rem .223 Rem .30 Carbine .300 AAC .32 ACP .327 Federal and moreStackable design for organized storageClearly marked hole diameter for easy identificationPerfect for reloaders working with small to medium cartridges this loading block provides safe organized cartridge handling during the reloading process with a precise custom fit for optimal stability.