Aiming to improve on the default design, the Leofoto NF-04 is a collar foot for Nikon AF-S NIKKOR 180-400mm f/4E TC1.4 FL ED VR, AF-S NIKKOR 400mm f/2.8E FL ED VR, AF-S NIKKOR 500mm f/4E FL ED VR, AF-S NIKKOR 600mm f/4E FL ED VR and Nikon AF-S NIKKOR 800mm f/5.6E FL ED VR. This is a meticulously engineered aluminum support with built-in Arca-type dovetail mounts featuring 1/4"-20 and 3/8"-16 receivers as well as a QD socket for quickly attaching a compatible strap or sling. Two M3 screws are included for use as optional safety stops.