TKR5345B – Brake Disc (hardened steel, NB/NT, 1pc) Product Description TKR5345B – Brake Disc (hardened steel, NB/NT, 1pc) Fully CNC machined, then hardened for strength, then ground for flatness, then coated for wear. This is the highest quality brake disc available. NOTE: This is one brake disc only, you need two discs to complete your vehicle.