Hejnar Photo Arca Type Foot replacement for Canon 300mm F/2.8 - Made in U.S.A Replacement foot for: Canon 300mm F/2.8. Foot leaves enough room for your fingers under the lens to freely use the lens focusing ring, although it does not allow hood reversal for storage. 5.75 inches long1.58 inches wideWeight: 7.6 oz (216g)1/4-20 and 3/8-16 tapped holesTwo safety stops. This prevents free fall when the clamp is not fully closed (M3 screws)Precision C.N.C. machined from 6061-T6 Aluminium Made in USAStainless steel hardware Black hard coat anodized surface One replacement footTwo M3 safety screws attached to footHex wrenches for M3 screw and original Canon mounting screws Stainless steel hardware. Black hard coat anodized surface.