Camera Accessory Cage by GTX Products Group. It's 12.5" x 10" and it has 80 - 1/4"x20 mounting points on side rails and 16 - 1/4"x20 thumb screws for mounting different accessories. It is all aluminum construction for lightweight strength. As an option you can pair this with our T-QRP for quick release mounting and strength. Also available with our heavy-duty ball head T-BH350. Order at your local camera store or on our website www.gtxproductsgroup.com.