ARP 4306801 Stainless Steel 3-Piece Lower Pulley Bolt Kit Provides the reliability you need for racing or high performance street applications Manufactured from rust-proof stainless steel with compact 12-point style heads Rated at 170,000 psi, which is stronger than Grade 8 hardware Features a 3/8-24 thread size, .750 under head length, and 3/8 socket size Kits come complete with washers