Mazda rotor machined to fit the backside of the Rockwell driveshaft flange. Used with the Wilwood caliper Batwing pinion brake bracket. This rotor is drilled for the flange pattern, bored for the proper I.D. and spotfaced flat for the bolt heads. Socket head capscrews, "Allen bolts", required for the rotor/flange/ driveshaft connection, not included.