Apec Black Brake Disc Front (DSK3251B) - Improved longevity and performance. Quantity: 1 Unit. Rotor Style: two-part brake disc, slotted/perforated, Vented. Type: Brake Disc Rotor. Function: Brake Disc. Height: 73 mm. Outer diameter: 340 mm. Brake Disc Thickness: 30 mm. Number of Holes: 5. Bolt Hole Circle Diameter: 120 mm. Centering Diameter: 79 mm. Manufacturer: BMW. Extra Description: Apec Black. This is a two-piece vented brake disc designed for improved longevity and performance. It is a front brake disc with specific dimensions and features suitable for certain BMW models.