Canon RF800mm F11 IS STM RF600mm F11 IS STM This is a tripod mount for the above two lenses. It cannot be used with other lenses. It's in like-new condition, having been installed only once. The product is well-made. I'm selling the lenses, so I no longer need this, and I'm offering it at a low price. It's well-made. It's made of aluminum and can be attached to an Arca-Swiss standard head. There are anti-slip pins on the back for peace of mind. It's clean with no scratches, but since there is no box, it will be treated as a used item, so please understand this before purchasing. Shipping will be via Yu-Packet Post Mini. It seems that it takes a little longer to deliver than Takkyubin (home delivery service). Thank you for looking.