The Bayonet Male for UWL-400Q is a male bayonet that attaches to the UWL-400Q Wide Angle Lens (Cat. No. 5142) and 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): 55.8 x 10 mm / 2.2 x 0.39 inch Weight: 33.5 g / 1.3 oz Included in box: Male bayonet and rear cap Compatibility Designed for the UWL-400Q Wide Angle Lens (Cat. No. 5142). For compatible female bayonets, please see the Bayonet Mounting System Chart below.