DSLR Rig Cage With Top Handle Grip Leather Strap For Sony A7 A7r A7ii A7S Camera Made by CNC Aluminium, Hollow-out design,only 345g, lightweight but strong. Bridgeplate is processed by high precision machine. Handgrip strap including, more comfortable and allow you well hold the camera. 1/4" and 3/8" screw holders along the top and side of cage, standard 15mm rod system . Removable top handle. Suit for: for SONY A7,A7ii, A7S,A7r cameras Comaptible with is Release Baseplate; http://www.amazon.com/gp/product/B00K0CCU9M (The installation method is the same as the GH4 cage--http://www.tudou.com/programs/view/9xqEJeLWlxM/