JEGS Connecting Rod Guide Tools screw onto the connecting rod bolts and protect the crankshaft during installation. The Nylon construction of this tool protects the crankshaft from nicks and holds the rod bearing in place during assembly. The set includes two connecting rod guides and two set screws. Works with most connecting rods that have 3/8"-24 threads on the rod bolts or cap screws. The set screws are used on connecting rods with cap screws since the cap screws are removed during installation of the piston/rod. 2/set.