The Wheeler Engineering Universal Barrel Clamp is crafted with precision from high-quality aircraft-grade aluminum and features a non-marring urethane coating. This urethane layer is specifically engineered to safeguard the barrel's finish while offering exceptional gripping strength. It includes three distinct barrel openings measuring .85 inches .66 inches and .53 inches making it suitable for a range of barrels from AR pencil barrels to bull barrels. When placed in a vise the urethane coating compresses securely around the barrel ensuring a firm hold for the application of necessary force during installation or removal. The key features include a non-marring urethane coating and construction from aircraft-grade aluminum.