Polished 6-Hole Universal Fit Aluminum Horn Button for Aftermarket Steering Wheels This 6-hole horn button is made of aircraft standard 6061 high polished aluminum Has a universal 6-Hole bolt pattern which is compatible with all 6-hole wheels, such as NRG, MOMO, Forever Sharp, Grant, and Sparco Includes 6 Socket Cap Head Screws 10-32x5/8", 6 Socket Cap Head Screws 10-32x7/8", and 1 Spade Horn Wire Diameter: approximately 3.5 inches Height: approximately .70 inches Pitch circle diameter is 2.75 inches or 70 milimeters