It adds a rod port at the front for mounting an optional Axis Mini EVF mount or any 15mm rod accessory. In addition to the 1/4"-20 screw, the bracket also slides into the cold shoe on the C100 handle for extra security. For mounting additional accessories, the top of the bracket features 1/4"-20 and two 3/8"-16 threaded holes (positioned 1/2" apart) on the top of the bracket, 1/4"-20 holes on the back of the bracket, and a built-in cold shoe mount in front of the rod port.