Detailed product specifications Manufacturer: FCP Engineering Model: FCPRHO1485221 Profile: H beam Center to center: 148mm Large tip diameter: 52mm Bushing diameter: 21mm Quantity: 4 pcs, 8 pcs ARP2000 3/8" screws Made of: 4340 EN24er forged steel Announced power: 600KM (4-cylinder engine)Announced rotational speed: 9000RPMOpel / Vauxhall - 2.2 16V (X22XE and Hybrid C22XE, C22LET)After ordering, please specify the width of the large tip you need: 21.90mm or 26.30mm!