Designed for complete concealment, this magazine holster sits inside the waistband and under the belt. With the ability to tuck your shirt in while wearing, it is virtually invisible. The perfect accessory to accompany our concealed carry holsters. Small Version: Fits magazines 7/16" to 1/2". Designed to fit straight stack 9mm like a LC9 or PM9. Medium Version: Fits magazines 1/2" to 9/16". Designed to fit straight stack 45 like a 1911 or Springfield XDs. Large Version: Fits magazines 9/16" to 5/8". Designed to fit staggered stack magazines like a S&W Shield. XL Version: Fits magazines 5/8" to 3/4" Designed to fit staggered stack magazines like a Glock 43.