New Hejnar Photo New Hejnar Photo Multipurpose bidirectional 1.75 inch diameter dovetail plate. Dovetail plate allow user to mount their tripod head to any Arca-Swiss style clamp. The round dovetail plate will contour the base of either a ball head or gimbals head. Dovetail plate mounted to a base allows for a quickly change of tripod heads when working with different heads on multiple tripods and monopods. International standard dove-tail rail, compatible with Arca-Swiss type quick release clamps