Diamond Engineering 12-Point Rear Brake Rotor Kit PB532S Polished to a mirror finish Custom 450 stainless steel 12-Point bolts have 180,000 psi tensile, which is 20% stronger than Grade 8 UNJ3A rolled threads Belt/sprocket kits are ideal for high-performance applications; Race Proof belt/sprocket bolts can withstand as much horsepower as you can throw at them many Harley Top Fuel racers use these same bolts withoutfail for over a decade