AZ8 Tripod Coupler. Connects AZ8 to G11 or GM8 Tripod.
Center hole is 3/8" unthreaded, top plate is approximately 1/2" thick
For the same plate with a 1/2" unthreaded center hole order : https://store-losmandy-com.3dcartstores.com/mal-to-ma-adapter.html