The Gitzo C profile Series 1-5 Aluminum Extra Long Quick Release Plate takes the place of a balance rail in Gitzo type C tripod heads, allowing you to adjust the position of a spotting scope, video camera or still camera in order to balance it perfectly on the tripod head. It is specifically designed for wildlife, sports and action photography. It is an ideal complement to the Series 2 Two Way Birding Head GH2720QR and other Gitzo equipment compatible with C profile QR plates. The plate includes 2 screws for both 1/4" and 3/8" sizes. In this collection, Gitzo unified some 1/4" and 3/8" attachment plates into a single code including 2 screws for both 1/4" and 3/8" sizes. Having two screws available for each attachment size is recommended for long plates, when heavy equipment or long lenses are used. As a general rule, it is preferable to always use the biggest possible attachment. Even when the smaller screw needs to be used, it always guarantees a high safety standard. All Gitzo bolts and screws are made of steel.