Check the listing for details. PEM 5x5" Street Rod Rear Brake Rotor 11 1/4" OD x .960" wide. Condition: New. Listed at 76.95 USD. PEM Street Rod Vented Rear Brake Rotor 11 1/4" OD x .960" wide 11-1/4" vented rotor with 5 on 4-1/2" and 5 on 4-3/4" bolt circles.ADDED 5 X 5" BOLT PATTERN With 1/2" holes4 1/2" bolt pattern has 1/2" holes and 4 3/4" bolt pattern has 7/16" holes for stock wheel studs.Three sets of bolt pattern as shownRotor has 6.25" Inside Diameter for axle flangeRotor width is .960" where the brake pads work. Hub Register Inside Diameter is 2.78".Brake Hat Backspacing is 2.25".Thickness on the rotor hat/flange where it bolts to axle is .250" (+ or - .10").weighs 13.45 lbs. Disclaimer. Warning! Auto racing is a hazardous sport. No warranty or guarantee is made or implied regarding any racing product sold by Performance Engineering and Manufacturing, LLC. User assumes all risks. We will ship using USPS Priority Mail Delivery Confirmation Number after shipped. We do ship using Speedee Delivery in the Upper Midwest. WARNING: Cancer And Reproductive Harm- www.P65Warnings.ca.gov