Wilwood Rotor-SRP48 SPC-37-LH-BLK-Drill 12.88 x 1.25 - 12 on 8.75inSRP Drilled Performance Rotors feature a specially engineered directional cross drill and face slot pattern that improve brake response and pad performance throughout the entire range of light to heavy braking. The venting and cleaning action of the holes and slots will reduce pad glaze and disperse gasses and heat generated during the pad to rotor interface. The holes and slots also inhibit irregular pad compound build up on the rotor faces resulting