Scaffolding Knuckle Joint Royalty-Free Stock Photography

Spotted this, on the top of a blue transformer box just inside the compound of a local sailing club, at first I thought it was something to do with a boat, but I later discovered it was used to help build and secure scaffolding poles on building sites, I thought it would make an unusual still life the blue of the box contrasting nicely with the shimmering water of the lake in the background