This is a home-crafted oil filter wrench for tight spaces on modern automobile engines. It is made from an old piece of 1/2 inch black iron pipe and a pipe end cap. Also used is some discarded bicycle chain. The wrench is operated by a 3/8 inch drive socket ratchet.
The chain tightens its grip on the oil filter as the pipe twists when pressure is applied to the ratchet handle.
These common wrenches do not always fit the space available on an automobile. The end cap style (center) sometimes should fit a particular filter, but does not. Sometimes no end cap wrench is available for a particular filter. The wrench described in the Instructable can be made to fit whatever filter your car uses.