3M™ Cable Stackers SI-1 and SIFS-1 organize cable runs with convenient space management and aid in identification. The 3M™ Cable Stacker SI-1 centers multiple cables on a 2 X 4 framing member. The 3M™ Furring Strip Cable Stacker SIFS-1 routes, fastens, and supports CATV, telephone, security and instrumentation cables.