Thank you for viewing. This is an elbow rest for fishing rods. The elbow rest prevents the rod from slipping and stabilizes rod operation. It is made of wood and the pipe diameter is approximately 17.5 mm. The manufacturer is unknown. Please refer to the photos for details and make your judgment. Please refer to the photos for the condition. # For Tenkara rods, raft rods, Kawagihagi rods, etc.