Safariland 6360 Level III ALS Retention Duty Holster, Mid-Ride, Black, STX Tactical, Glock 20, 21 with ITI Streamlight M3 Light The 6360 Model features both the ALS (Automatic Locking System) and the SLS (Self Locking System) all which provides the weapon Level III Retention, while holstered; A Hood Guard is standard Features a slim, compact design which allows holster and weapon to ride close to your body, providing quick draw when necessary Simple straight up draw once all releases are activated STX Tactical is very fine textured finish; famous for its incredible strength and abrasion resistance Fits Glock firearm 20/21 with light