Blackhawk 410610PBK: With twice the capacity of the single mag case, Blackhawk\'s double mag case is curved to the waistline for slimmer profile, and an adjustable belt-clip hook accommodates belts of different widths. It has a built-in tension spring to securely hold magazines of various sizes (9mm/.40 cal/.45 cal/10mm/.357 Sig). This double stack model has compartments for two double stack magazines and a matte black finish.