The brass or stainless steel SnoPost™ when threaded into the clamp provides for the addition of a second SnoRod™, about 2" above the first. A double rod configuration is called "SnoFence™", and is more durable for heavier service load conditions.
The SnoPost™ E is used at the rate of one per 48' of assembly, and at the ends of the assembly to "fix" the SnoRod™, preventing lateral movement.