CYLINDER BASE NUT WRENCH (LONG)

1/2″ or 3/8″ Internal Nut Wrench with 1/2″ square drive. These wrenches are designed specifically to install and remove the cylinder base nuts on Lycoming Narrow Decks (all models), IO-390, and IO-580 engines. Superior quality product made of drop-forged 4130 steel and hardened to 48 Rockwell.