Hejnar Photo Arca Type Foot replacement for Canon 100-400mm f/4.5-5.6L IS II USM - Made in U.S.A Replacement foot for100-400mm f/4.5-5.6L IS II USM. Foot leaves enough room for your fingers under the lens to freely use the lens focusing ring. 4.95 inches long. 1.50 inches wide. Weight: 4.5 oz (128g). 1/4-20 and 3/8-16 tapped holes. Two safety stops. Precision C.N.C. machined from 6061-T6 Aluminium. Stainless steel hardware. Black hard coat anodized surface.