This bracket attaches to any top plate or riser with 9mm spaced 1/4-20's. It features two captive 1/4-20 screws and have 1 x 3/8-16 tapped hole with ARRI pattern and 9 x 1/4-20 tapped holes with 9mm spacing. This plate can also be used to screw down horizontally onto a top plate or cheeseplate to add a 3/8-16mm tapped hole w/ARRI pattern.