PVRacking Wire Clips can safely hold wires in the T-slots of the Rails. Designed with stainless steel springs and EPDM cushions for unmatched outdoor performance. PVRacking WireLoops can safely hold wires in 3/8? T-slots. The WireLoop holds up to 10 PV wires and it can hold large micro-inverter wires as well. Made of extruded aluminum with plastic ends to prevent fraying of wires. Holds up to 20 wires.