RCBS MatchMaster Multi-Cartridge Reloading Block 6061-T6 Aluminum Black None. Holding two case sizes/diameters in a single block this one tray does the job of two streamlining your workflow without sacrificing capacity. Each block holds .223 Remington and .308 Winchester cartridge families plus any other cartridge with a .384 or .470 bolt face diameter. Precision-machined from solid 6061-T6 high quality billet aluminum. It's stackable ultra cleanable with pass-through powder holes and built to last a lifetime. With room for 50 cartridges and generous spacing for easy handling your bench just got twice as efficient. Specifications for RCBS MatchMaster Multi-Cartridge Reloading Block: Manufacturer: RCBS Projectile Caliber: .308 Caliber .224 Caliber Caliber: .308 Winchester .223 Remington Color: Black Fabric/Material: 6061-T6 Aluminum Features of RCBS MatchMaster Multi-Cartridge Reloading Block DuelFitTM Design: Holds two case sizes in a single tray .384 or .470 bolt faces cartridges like .223 REM 5.56 NATO 6MM ARC .243 WIN. 6.5MM CRD. 7MM-08 REM .300 AAC BLK. .30-06 SPG .308 WIN. and more PrecisioneeredTM Case Holes: Allows powder to fall through for easy clean up Stackable: Organize & declutter your bench No-Slip Feet: Keeps the tray stable during loading or case processing Package Contents: RCBS MatchMaster Multi-Cartridge Reloading Block RCBS 9499: MatchMaster Multi-Cartridge Reloading Block 6061-T6 Aluminum Black None