Rear Brake Rotors 11.75 x .81 Cast from premium grade long grain carbon iron which exhibits long wear high thermal stability excellent resistance to distortion 32 vane design provides superior heat management and long service life The straight vane design allows the same rotor to be used on both left or right hand sides 8 on 7" mounting bolt circle is commonly used on brake hats and Grand National hubs Cost effective alternative to the big name brake companies' rotors Thickness: GM .810" Outside Diameter: 11.75" # Holes: 8 Bolt Circle: 7" Thread: Thru Weight: 8.00 lbs Bryke Racing Part #: PR 910-31906