Nut with a built-in lock plate. Never a loose transmission pulley again, that is what the MegaNut is all about. The built-in lock plate in the Jims MegaNut works with all OEM and aftermarket pulleys. Some aftermarket pulleys may require an additional hole to be drilled and tapped in the pulley, so the lock bolt can be installed. Repl. 35241-06 nut 35242-06 lock plate 3595 lock plate bolts. Note: See 978332 for JIMS socket tool.