A tool-less screw in 19 mm studio support adapter Compatible with following products: K2.0013427 LMB 4x5 15mm Lightweight Support Console K2.0013447 LMB 4x5 Swing Away Tilt Module K2.0019275 LMB 6x6 Clamp Adapter 143mm K2.0019156 LMB 6x6 Clamp Adapter 165mm K2.0019085 LMB 6x6 Tilt and Flex Adapter 80-156mm