DBA 2015 23 4000 Series T3 Rear Slotted Rotor Pair DBA T2 Front Uni Directional Slotted Rotor GMC Sierra 2500 (99 04) (DBA2048S) DBA Silverado 1500 4000 Series T3 Slotted 6 Lug Rotor; Rear DBA42011S DBA 5000 Series 2 Piece Drilled and Slotted Rotor (Front) 2015 2017. Notes Regarding Vehicle Compatibility: Vehicle fitment provided in this listing is to be used as a rough guide only and may not actually suit your vehicle. Due to multiple brake packages sometimes being offered by manufacturers it may be necessary to measure your existing brake discs and or pads and compare with the measurements provided by DBA here: DBA Part Finder Click "Part Number Search" tab and input SKU provided above. Returns Exchanges will incur restocking and freight fees or may be denied in certain circumstances. DBA's 4x4 Survival Series T2 rotor provides all the benefits of DBA's Street Series direct replacement rotors with the added benefit of performance braking through the introduction of DBA's patented T2 slot design. The T2 slot design features precise CNC machined bi symmetrical slots, resulting in a quieter, more responsive and smoother brake pedal feel. The T2 slot increases the number of exit points, allowing friction dust and gases to escape and enhancing the pad bite. DBA's revolutionary universal slot design also eliminates the need for separate left and right slot designs seen in traditional rotor designs. We recommend the T2 slot design for more intensive braking applications. Features (Where Applicable): Kangaroo Paw 144 diamond and tear drop pillar ventilation system Increased surface area resulting in greater heat dissipation which minimises brake fade and increases braking effectiveness CBN (Cubic Boron Nitride) machine turned Reduced DTV (Disc thickness variation) and parallelism which provides less occurrence of brake shudder or brake pedal "judder".