• Works on 1993-newer Cadillac 4.6L V8 Northstar engine, and 1995-1999 Oldsmobile Aurora 4.0L V8.1/2" sq. drive for use with 1/2"drive breaker bar or ratchet.
• Tool is designed to self-center in the water pump housing, allowing the tangs to fully engage the water pump for removal or installation.