This Leofoto Lens Foot is designed to replace the standard Sigma lens collar foot for the Sigma 150-600mm f/5-6.3 S lens. It's made of aluminum and features an Arca-type dovetail in a low-profile and lightweight design. It's only 0.75" in height, and, at 3.3 oz, is about half the weight of the standard Sigma version. It also features a QD socket on the bottom for quick release attachment of optional carry straps. Two M3 screws are included for use as safety stops.