Guardrail mounted sign stands allow 36" and 48" roll-up and rigid signs to be firmly affixed to guardrails. Simply hook the top clamp over the top of the guardrail, slid the bottom clamp up, and tighten the "T" screws. Wind-relieving dual spring and no-spring models are available.Choose the model for your sign type: RUB for roll-up signs, RGB for rigid signs, or RG/RU which comes with brackets to hold both roll-up and rigid signs.