Review on Assenmacher Specialty Tools 0284 14Flats by Chris Hernandez

I have to agree that this is a must for changing the oil filter on a Mercedes 3L Diesel. As far as I know this is the only wrench available and it does the job. However, I was disappointed that the "rough" cast key did not have the 3/8" square shank found in most keys of this type. Wrench sets end at 13/16", while their cheaper 74mm wrench has a regular 3/8" square drive socket. I only paid $20 but some establishments sell this key for $60. They just seem proud of a key that lacks standard features and is scratched by the grinding wheel. I guess I should be thrilled that it's made in the USA, but it looks like something for $3.97 at the hardware store.