Caldwell Mag Charger Universal Pistol Loader Features -Universal magazine design Works with both single-stack and double-stack magazines Loads 9mm, 10mm, .357, .40 and .45 cal ammo Simple to use - Just drop in a round and squeeze the lever Extremely durable polycarbonate construction Adjustable side shims align magazines of any width for optimal use. Shims are labeled with numbers for quick adjustment Lock knob keeps virtually any size magazine secure Ergonomic die cast aluminum handle for easy