Check the listing for details. PEM Slotted Street Rod Rear Brake Rotors 11 1/4" OD x .960" wide - PAIR. Condition: New. Listed at 149.00 USD. PEM Slotted and Dimpled Street Rod Vented Rear Brake Rotors 11 1/4" OD x .960" wide This listing is for a pair of brake rotors as shown. Left and right are slotted differently. 11-1/4" vented rotor with 5 on 4-1/2" and 5 on 4-3/4" bolt circles.4 1/2" bolt pattern has 1/2" holes and 4 3/4" bolt pattern has 7/16" holes for stock wheel studs. Rotor 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 12.7 lbs. each rotor 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 and will send a Delivery Confirmation Number after shipped. Sometimes we ship using Speedee Delivery in the Upper Midwest. WARNING: Cancer And Reproductive Harm- www.P65Warnings.ca.gov