Aiming to improve on the default design, the Leofoto SF-03 Lens Foot is a replacement for the original foot supplied with the Sony FE 400mm f/2.8 GM OSS and FE 600mm f/4 GM OSS lenses. This Arca-type-compatible foot features both a 1/4"-20 and 1/3"-16 receivers, double-dovetail mounts, and a QD (Quick Disconnect) socket for quickly attaching a compatible strap or sling. Additionally, two M3 screws are included for use as optional safety stops.