The ARP Main Studs are high-performance parts designed specifically for All Seadoo 4TEC 1503cc 1630cc models, including 130, 150, 155, 215, 255, 260, 300, and 325. Manufactured by ARP, a trusted brand known for quality automotive fasteners, these studs provide superior clamping force & Main Cap walk. Perfect for enthusiasts looking to enhance the performance of their Seadoo watercraft, these main studs are a must-have for those seeking added power and reliability.