Comet RS-Series Brake Discs H881ST2. COMET Discs provide exceptional quality Floating and Solid Brake Disc which offer incredible performance for the price. 2x H881ST2 Comet Brake Disc. Distance between Hole to Hole: 120mm. Pitch Circle Diameter (PCD): TBA.You can send us a message by using the "Questions and answers" section towards the bottom of the page.