This is the factory QR plate from Nest designed specifically to engage the high security locking pin system on their Carbon Fiber Gimbal Head. These plates are 6" long to allow plenty of balance adjustment for your camera/lens combo.
This is the 2015 version of the plate and adds 6 rubber pads to the top of the plate for better twist resistance when mounted on single tripod hole lenses. It no longer has the imprinted scale on the sides of it as that scale tended to wear off over time anyway.
If you currenty have the pictured plate, you will likely NEED that type plate for a spare. These original plates are now out of production and I am totally sold out of them. I have no idea if I will ever be able to get more of them. Due to the slight profile change these newer plates MAY NOT clamp fully in the original slide-in mounts. PLEASE check the security of the plate clamp before mounting the plate to a lens.
WHEN IN DOUBT, SHOOT IT AGAIN!!!