A very skillful friend made this from bamboo. It has a hole for inserting a bamboo skewer to set the bait. The mechanism works like this: when a bird comes to the bait and lands on the rotating part, it rotates and takes the bird inside. Other birds then come and are also taken inside. It can be hung from a tree using the attached wire. The bamboo skewers are thick, so it's sturdy. There's wire inside to hang the bait so the captured birds can eat. It was made by an amateur, so it's a little warped, but please understand. It's quite a good piece. The dimensions are 34x18x27cm (height).