Blackhawk! Swivel Kit 115 1&rdquo; Lok-Down 1&rdquo; Blued Provides a reference point on forend for consistent grip Improves weapon manipulation and control Enhances function of other accessories such as vertical grips Can be inverted to provide both high and low grip options Constructed of high-performance fiberglass glass-reinforced polymer 1-Inch Blued Precision-machined and assembled to exacting tolerances LOK-DOWN Swivel Set Machine screw forend base Wood screw rear base