Water Pump Bolt Water Pump Pulley Bolt Water Pump Pulley Bolt; Socket Head; 3/8 in. -24x1 in.; Grade 8; 4 Bolts Per Package; Chevrolet w/Aluminum Pulley; SPECIFICATIONS: Engine Make/Size: Universal FEATURES: For Use With Aluminum Water Pump Pulleys Corrosion Resistant Black Oxide Plated Finish Countersunk Socket Heads Made From High Quality Materials Spectre's Water Pump Pulley Bolt Kit is engineered to provide premium quality hardware for aluminum water pump pulleys. This set includes four 5/16 inch-24 by 3/4 inch tapered Allen bolts. Manufactured from high quality steel, these grade 8 bolts feature a black oxide plated finish for corrosion resistance. Spectre Performance, a leading manufacturer of performance racing auto parts.