For mirrorless interchangeable-lens cameras. Specifications: [Size] Maximum diameter 104mm x depth 84mm [Weight] 337g [Pressure Resistance] 100m water depth [Material] Corrosion-resistant aluminum alloy (anodized) + reinforced glass (multi-coating) [Length from the mount surface to the back of the glass receiver] 63mm I purchased this used, but it didn't fit my camera mount, so I am selling it. I think the condition is quite good.