This holster is a concealment version of the Automatic Locking System (ALS) series holsters. Once the weapon is holstered, it locks into place, providing an extra measure of security from standard open top holsters. A straight up draw is possible once the ALS is de-activated. It comes standard with the 745BL belt clip for 1.5 in. (38 mm) to 2.25 in. (58 mm) belt widths. Suede lining helps protect the gun's sights and finish; SafariLaminate construction with a tough STX finish. Fits: Glock 21