This is a Glock compatable speed loader, for use with the original 44 G44 G 44 factory magazines. Will not work on Pro Mag 18 round magazines! This loader has extra-large, thicker finger grips, for easier loading. No more sore fingers from grabbing the tiny little slide grip that is on the factory magazine. Simply place it over the magazine and press it down with both fingers. The thicker / wider finger grips ensure a non-jamming easy sliding loading operation. The Magazine not Included. This will not work with Pro Mag magazines. Proudly made in the U.S.A. by veterans. Thank you for your support!!