Strange Engineering has been the leader in drag racing brake kits since 1965 and is the only manufacturer of one-piece forged steel brake rotors. The one-piece design is far superior to common bolt-together two piece rotors in weight reduction, strength, and longevity. All Strange Pro Race rotors are slotted. Slotting was developed by Strange to minimize warpage while maximizing weight reduction. Every kit features the sought-after 4-piston directional caliper. The directional caliper accomplishes superior bridge bolt strength at only 2.70 pounds. Strange directional calipers feature 1.750'' and 1.625'' O.D. stainless steel pistons to assure optimal pad wear and exceptional pedal/handle feel. Every caliper is internally ported and includes .100'' square O-rings to assist piston retraction. Brake offset is measured from the outside of the housing end to the outside of the axle flange.