The Lens Holder 67mm for UL-Type Arm is a lens holder that attaches to Flat UL-TYPE 1'' ball arms and allows for secure attachment of 67mm accessory lenses when they are not in use. Specifications Material: Hard Anodized Aluminum Dimensions (D x H): 74.7 x 17.5 mm / 2.94 x 0.69 inch Weight: 53 g / 1.87 oz Included in box: Lens Holder, short screw and long screw Compatibility Mounts on Flat UL-TYPE 1'' ball arms. For securing two wet lenses, two lens holders can be mounted opposite each other on the same arm. Can be converted to a bayonet lens holder by mounting the Bayonet Female on M67 Housing MB1 (Cat. No. 4050) on the lens holder. Click Here for the Bayonet Mounting System chart.