Hejnar Photo Arca Type Lens Plate for Canon 70-200/f2.8 and Canon 100-400mm - Made in U.S.A Quick release plate for Canon 70-200/f2.8 or Canon 100-400mm. 3.60 inches long. 1.50 inches wide. 3/8 inches thick. Precision C.N.C. machined from 6061-T6 Aluminium. Stainless steel hardware. Black hard coat anodized surface.