Arkon RM382XMAMPSSH 7" Heavy-Duty Metal AMPS Mount with Security Hardware - 38mm (1.5 inch) Ball Compatible (sku 55950)7 inch durable mount is ideal for commercial vehicle use Features heavy duty metal 38mm (1. 5 inch) compatible Robust mount Compatible with devices with 4 Hole AMPS pattern Accompanying security hardware helps deter theft The RM382XMAMPSSH 7 inch Heavy Duty Metal 4 Hole AMPS drill base mount with security hardware is part of Arkons Robust Mount Series. Ideal for commercial vehicle use, it features Arkons 5 inch metal 38mm (1. 5 inch) compatible shaft