Review on W38151 Wobble Extension: Enhancing Performance and Flexibility in Tool Usage by Chad Judex

Shown next to the spark plug head. The product has two positions. In the first position, it offers slight angular movement in either direction, which is what I got it for. Pushing it all the way in makes it stiff and looks like a 3 inch extension. I believe the notion of two positions is supported by the spark plug socket but not by other applications.