truest running kits on the market every componentexcept linings is manufactured in-house ... special 5/16 thick 7075-t6 aluminum caliper mounting brackets aluminum rotor hats ... 81100 rotors solid or drilled steel or carbon now feature the slot-drivetm attachment ... of the system a pair of mw 4 piston calipers with linings are included mw calipers ... are exceptionally strong compact and engineered to provide optimum ... clearance but the most important characteristic of the calipers is their bridge ... with regard to bridge strength on calipers of this type is the fastener strength ... even though the material used in mw calipers is nearly 30 stronger than billet 6061- ... effect on the bridge strength all mw calipers use four 7/16 diameter fasteners plus ...