Sea & Sea DX COMPACT MACRO PORT S IIThe port has a M67 screw mount on the front.Required component] NX Compact Macro Port Base[Depth rating] 100m / 330ft[Dimensions (DIAxD)] 103x54mm / 4.1x2.2inch[Weight] Approx. 210g / 7.4oz[Construction] Corrosion-resistant aluminum alloy (anodized) + Tempered glass (multi-coated)