Each Hilliker Holster Co universal mag carrier is formed using a specifically designed CNC mold. Using our Magazine Retention Device, it allows the shooter to make incremental adjustments to the retention of their mag draw. Our universal magazine carriers fit the following magazines: Single Stack: Single Stack 9mm Magazines  Single Stack .40 Magazines  Single Stack .45 ACP Magazines Double Stack: Double Stack 9mm Magazines Double Stack .40 Magazines Included with each mag carrier is either our 1.5" belt clip or an ulticlip option which can be switched from side to side to accommodate left and right hand shooters.  Ulticlip: Specifically designed to be used without a belt, the all new ULTITUCK makes it possible to carry confidently in all styles of clothing. Want to carry in sweats, gym shorts, leggings or jeans without a belt? Our ULTICLIP mag carrier is best way to go!