XtraArm Quad Link ATV Rest w/ Ball Head Adapter Black. Our heavy-duty ATV clamp mounts securely to most utility four-wheelers equipped with bar-style racks creating a solid foundation you can rely on in the field. The system also includes our height adjustment unit allowing you to comfortably shoot from a seated or standing position. The Ballhead Adapter features a standard 3/8''-16 stud allowing you to mount your own ball head directly to the XtraArm for maximum control and flexibility. Built with the same rugged standards as all XtraArm products the Quadlink Rest is designed to perform in real-world conditions without compromise. Specifications for XtraArm Quad Link ATV Rest w/ Ball Head Adapter: Manufacturer: XtraArm Color: Black Package Contents: XtraArm Quad Link ATV Rest w/ Ball Head Adapter XtraArm XTRA-QLATVCAM: Quad Link ATV Rest w/ Ball Head Adapter Black