Loads all 9mm Luger, .357 Sig, 10mm, .40, and .45ACP cal. single and double stack magazines., including 1911 mags, of all manufacturer, and also loads most .380ACP single and double-stack mags; Pocket-size. One size fits all. No inserts, spacers or adjustments at all; Easy loading; the rounds just drop in with no thumb pushing or pressing; No more pain! Load hundreds of rounds painlessly; Protects your fingers and mags; Up to one round per sec. loading rate. 1/3 the time loading several mags with thumb; Fits in hand and pocket, weighs only 66 grams (2.3oz); Highly durable