Description: Product: This Traction Board Mounting Set is good for enhancing the functionality of your vehicle.Material: The Heavy Duty Recovery Board Mount is made from durable metal, ensuring long time use and durability.Safe: The Roof Rack Acceory keeps your Traction Board safe on rough terrain.Usage: It is suitable for 4.72inch to 6.69Inch in Hole Spacing of Roof Racks and Truck Bed racks.Wide Application: The Car Exterior Acceories are good for outings, car campings, off roadings, or convenient storage for your getaway board. Specification: Base Plate:20cmx5cm/7.87inchx1.97inchBolts:14cm/5.51inchBolt Sleeves:3.5cm/1.38inch Package Includes: 2 Base plates4 Bolts4 Knobs4 Bolt Sleeves8 Washers8 Nut Note: Please allow slightly errors due to manual measurement and different monitors.