Opening range 2-1/2 to 3-1/4 inches. It only blocks and bites the filter when rotated counterclockwise (distance). Due to the one-sided action of the cam, the filter cannot be tightened. Most oil filter manufacturers recommend tightening 1/4 to 1/2 turn AFTER hand tightening, so some kind of tool is required. I use a strap wrench but if you have a smaller filter this is a good removal tool. I wanted to buy a Lisle instrument with a similar design but it was a little cheaper. Let's see how long this lasts.
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