Wilwood's 3. 00" x 42 splined axle mount rotors are manufactured from the same high strength billets with the same precision as our 3 hole mount front rotors. Full symmetrical machining provides perfect balance, perfect flatness and the truest rotation of any aluminum rotor being built. Wilwood's engineered drill and relief slot pattern combines the highest degree of weight reduction with the highest resistance to thermal distortion in the contact faces. You get smooth engagement and a consistent full pedal from the low kNck-back characteristics of this design. a durable black aNdized finish prevents corrosion and simplifies the visual inspection of the contact faces. The best results are always achieved using PolyMatrix Q compound brake pads with these rotors.Pit Stop USA offers Wilwood Drilled Aluminum Rotor .310" Width - 10.20" Diameter - 42 Spline - 1.9 lbs. 160-3270 at low everyday prices. Be sure to check out all of our products from Wilwood Engineering including Wilwood Engineering Aluminum Rotors and Wilwood Engineering Drilled Aluminum Rotors and Wilwood Engineering Rotors.