Clearsonic AX2412X1 Height Extenders add 12 inches of height to standard CSP systems. 'H' channel and hinge are included. The AX2412x1 is normally used as an add-on to increase the width of an existing AX2412 system by 24 inches. When it's time to break down, CSP systems with AX height extenders installed correctly will still fold 'accordion style' for easy storage.