What is this tool thread? Take a guess. Stump the Toolman!

mine has straight legs and no knurls on it, but it has to be one of my favorite tools

it is ridiculous how tight some people put their oil filters
Been in the biz for 30 years. Have had my share.
Shop across the road,with a customer that alternated for oil changes. The motorcraft filter was always a battle as their lube tech would crank em on, knowing full well who was taking it off. Mentioned it to customer, all he said was payback’s a *****. So i wrenched the filter on. Aparrently they tried to charge extra for a stuck filter. Customer knew the deal and refused to pay. :lol:
Never had a problem after that.