For mirrorless camera housings.

Specifications
[Dimensions (DIAxD)] 104 x 84mm / 4.1 x 3.3 inches
[Weight] 337g / 11.9 oz
[Depth rating] 100m / 330ft
[Construction] Corrosion-resistant aluminum alloy (anodized, anti-reflection coating on inner surface)
[Distance] Between the port mount and inner glass surface : 63mm / 2.5 inches

For mirrorless interchangeable camera housings. The port has an M67 screw mount on the front.

Specifications
[Dimensions (DIAxD)] 93 x 59mm / 3.7 x 2.3 inches
[Weight] 220g / 7.8 oz
[Depth rating] 100m / 330ft
[Construction] corrosion-resistant aluminum alloy (anodized), tempered glass (multi-coated)
[Distance] Between the port mount and the inner glass surface : 33mm / 1.3 inches

Specifications
[Dimensions (DIAxD)] 140x90mm / 5.6x3.6inch
[Weight] Approx. 500g / 17.5oz
[Depth rating] 100m / 330ft
[Construction] Corrosion-resistant aluminum alloy (alumite coating) + Acrylic
[Distance] Between the mount and the inner glass surface: 80.2mm / 3.2 inches