Bulldog Cases Extreme Glock 20/21/37 Outside the Waistband Ambidextrous Holster Belt Loop & Clip - Bulldog's Extreme series holsters have four wall construction. The outer wall fabric is heavy-duty, water-resistant nylon, and the inner wall has a vinyl vapor barrier with deluxe padding and a soft, scratch-resistant fabric. It has a spine protector to keep gun sights from tearing the inner lining. Extreme series holsters feature an ambidextrous clip and belt loop. Ambidextrous Belt Loop & Metal Clip Soft, Scratch Resistant Inner Lining Spine Protector Keeps Gun Sights From Tearing The Inner Lining Fits for: Large Frame Autos with 3.5in - 5in Barrels (Beretta/Taurus 92, Glock 20-21-37, Etc).