The OTR 16.5" x 5/6" Brake Hardware Kit keeps Expertise Built In , providing the parts your semi truck needs in order to keep your rotors and brake pads in pristine condition. This heavy duty replacement kit is recommended when new brake rotors and pads are installed in order to ensure your Anti-Lock Brake (ABS) system stands the test of time while being exposed to moisture, corrosion, and extreme weather elements. FleetPride is the First Click in Heavy Duty .