Fantasea Bayonet Male for 67mm Macro LensThe Bayonet Male for 67mm Macro Lens is a male bayonet that attaches to almost any "wet" macro lens with a 67mm thread. When mounted on the macro lens, it allows easily installing and removing the lens from the housing lens port or lens holder with a 1 4 turn*. * A compatible female bayonet must be installed on the housing lens port and lens holder. Specifications Material: Hard Anodized Aluminum Dimensions (D x L): 100 x 14. 5 mm 3. 94 x 0. 57 inch