Cog type thing.

I'm not entirely sure what this thing is. I know it is used to open and close the locks down by the river but that is about as technical as it gets for me.
Anyway, down by the river when playing with depth of field I took the following photo..

Even though the background is overexposed I think this image works quite well, possibly because the background is also out of focus. The main cog is what I focused mostly on, as it was here that the majority of the texture was. My aperture was 4.5 with a 125 shutter speed if I remember correctly.

Theres nothing special about this photo, I only uploaded it to show the cog thingy in use. Afterall, the man sortah forced me out of the way and stopped me taking pictures so he could open the lock.