The ARP stainless steel water pump pulley stud kit includes 5/16-24 x 3.500 in hex studs with a 2.250 in fan spacer and is intended to secure a water pump pulley and its fan spacer as described. This kit lists the thread size, stud length, and spacer dimension to match the specific pulley assembly needs called out in the product description, helping during reassembly or replacement of pulley hardware.
ARP 5/16-24 X 3.500 SS Hex Water Pump Pulley w/ 2.250in Fan Spacer Stud Kit