Weld on rack mount for heavy duty rack and pinion. Requires welding. Predrilled for ease of installation. Thickness: 1/4 inches Bolt pattern: 6 inches x 1 inches Bolt hole diameter: .414 inches Length (Top): 8 1/2 inches Length (Bottom): 10 1/4 inches Height: 2 1/2 inchesWeld On Bracket for Heavy Duty Rack & Pinion Short Version