The 3M™ Cable Stacker SI-1 centers multiple cables on a 2 X 4 framing member, allowing simplified compliance with article 300-4-(d) of the National Electrical Code. Centers multiple cables on framing members. Simplifies spacing requirements of the National Electric Code and Canadian Electric Code. Organizes cable runs and aids in identification. Puts an end to tangled wires and the potential heating that could occur when cables are held together tightly under 1 clip. Easy installation with cables snapping in for a positive lock.