The Lens Plate for Canon EF 100-400mm f/4.5-5.6L IS II USM from Markins is constructed from Duralumin, which is hard anodized for a scratch-resistant surface. The dovetail design of the plate is compatible with Arca-type heads or clamps, and the 1/4"-20 socket under the plate can be used to mount directly on a monopod or tripod if no quick release system is present.