Uncle Mike's Pro-2 Tactical Duty Holster comes with a patented locking device which keeps the gun in the holster under the most unfriendly conditions. This Uncle Mike's Law Enforcement holster has a laminated panel that curves to fit on the leg in order to create a stable platform for drawing the gun. The adjustable design of this tactical holster positions the gun below the raid jacket or tactical body armor while the belt loop with a co-polymer stiffener fits over any belt. With Pro2 Duty Holster from Uncle Mike's the firearm is held fast by a non-stretch retention strap (thumb break) and a traditional outboard tensioning device. Also UM Law Enforcement Dual Retention Holster has an internal detent that engages the trigger guard.Patented internal locking deviceBolted to belt loop for stable carry and consistent drawInternal detent that engages the trigger guardFits Glock full size pistols Left HandedSize 21