Wooden Camera UMB-1 Universal Matte Box (Clamp On) 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 set of clamp-on adapter reduction rings for use with lens diameter ranging from 80mm to 136mm. 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 Clamp On configuration and 15mm LWS rod mountable configurations (Base or Swing Away) using optional accessories.  In the BoxWooden Camera UMB-1 Universal Matte Box (Clamp On)2 x Rotating 4 x 5.65" Filter Stages2 x Wooden Camera 4 x 5.65" Filter Tray for UMB-1 Universal Matte BoxWooden Camera Clamp-On Set for UMB-1 Universal Matte BoxTop NATO Accessory RailLeft NATO Accessory RailRight NATO Accessory RailWooden Camera Top French Flag for UMB-1 Universal Matte Box