The ARP BMW M50 / M52 S50US/S52US 2-Bolt Main Stud Kit is a performance upgrade for BMW engines. This kit includes high-strength ARP 2000 main studs, along with premium quality washers and nuts. The studs are designed to provide superior clamping force, which helps to reduce main bearing deflection and increase crankshaft stability. The kit is a direct replacement for the OEM main studs, and is designed to work with both the M50 and M52 engines. The kit also includes detailed installation instructions, making it easy to install.