The Wooden Camera UMB-1 Universal Matte Box (Base) mounts to 15mm LWS rods using a height-adjustable bracket and features two rotating 4 x 5.65" filter stages, with an optional third stage available as an add-on. It has a 143mm diameter opening and includes a universal cloth donut with easy-to-grab finger loops. For accessory mounting, the matte box includes NATO accessory rails on the left, right, and top. Completing the package is a folding top flag. The UMB-1 is designed to be user upgradable and can quickly transition between this Base configuration and Clamp On or 15mm LWS Swing Away configurations using optional accessories.