Matthews 18" x 48" Cutter (Flag) 169004 Cutters are square or rectangular frames with mounting pins attached. Used to control natural or artificial light. Can be used to protect the camera lens from flares, control spill light from other sources, or keep light from reaching an area on the set. Flag and Cutter frames will make it possible to position the instrument over the top of the set wall or to use two or more units to create a box for better light control. With this new design, there are now three square corners as opposed to the older design providing just two. MSE CAT 169004