Fantasea Bayonet Female on Arm MB2The Bayonet Female on Arm MB2 is a lens holder with a female Bayonet that attaches to Flat UL TYPE 1'' ball arms and allows for secure attachment of accessory lenses* when they are not in use. It enables easily installing and removing wet lenses* from the lens holder with a 1 4 turn. * A compatible male bayonet must be installed on the wet lens. Specifications Material: Hard Anodized Aluminum Dimensions (D x L): 100 x 44. 5 mm 3. 94 x 1. 75 inch