This item was purchased from a handmade goods seller by my husband. He used it twice and no longer needs it, so I am selling it. It's an En-to Kago Fishing Ippatsu Kago KK. It's made of stainless steel (32φ) with some plastic parts and weighs 50g. The lock releases upon water entry, allowing the lid to open at the desired depth. The lid will not open even if the cage touches the ground during casting.