Compatibility: RF 100-500mm F4.5-7.1 L IS USM. Built-in Arca-Swiss dovetail mounting and includes a Quick Detach (QD) Socket for quickly attaching a compatible strap or sling. 3/8" & 1/4" threaded mounting holes. Light-weight, Low profile and provides the best possible stability for your lens. Two safety stops are located on the bottom of the foot, which prevents accidental lens release when a quick release receiver clamp is partially open. Textured silicone pad for better ergonomics and added comfort. Hard anodized, aircraft grade aluminum for maximum strength and durability.