Description
Set of Two Federal Signal Hi‑Rise Under‑Clamps – Black Each set includes the correct‑size mounting bolts for attaching the clamps to your TwinSonic or other compatible light bar. All required hardware is shown in the updated images and is included for mounting to the underside of your light bar.
This listing is for the pair of black “under‑clamps” used on Federal Signal Hi‑Rise mounting systems. These clamps secure around the stainless Hi‑or-Low-Rise tube and connect to the gutter‑or-roof mount tubular brackets on the vehicle. If you already have the upper Hi‑Rise tube and gutter clamps, this is the lower clamp set needed to complete the installation.
Details
• Quantity: Set of 2 under‑clamps
• Color: Black
• Application: Federal Signal Hi‑Rise mounting systems
• Function: Clamps around the stainless Hi‑Rise tube and attaches to gutter‑mount brackets
• Material: Heavy‑duty cast-steel construction
• Condition: used (refinished original black)
Compatibility
Designed for Federal Signal Hi‑Rise mounts used on:
• Vintage light bars
• Emergency vehicle roof‑mount systems
• Classic police, fire, and public‑safety vehicles
These are the correct replacement parts for anyone restoring or reinstalling a Hi‑Rise mount where the lower clamp set is needed.
Shipping
Ships well‑packed and protected to prevent finish damage.
If you need the stainless Hi‑Rise tube, gutter clamps, or hardware, feel free to reach out.



