The Acratech Macro Focus Rail with Quick Release Clamp keeps view cameras in place for precise macro photography. The Quick Release Clamp features a large 15mm bulls-eye level, is a full 2.36" (60mm) long and weighs less than 3 oz (85.04 g). The rail features adjustable stops. It fits all "Arca-Swiss" compatible plates. The Acratech quick release clamp also features a detent pin to prevent the quick release plate accidentally sliding out. The Quick Release prevents rotation of the camera body, has notches where necessary to allow access to all controls and features, and a long screw slot to increase chances of compatibility with future cameras.