The original ad says it is high strength aluminum. It's either cast or die-cast (both less durable) and painted silver to make it look like a smooth aluminum finish. It has "pull" (required for pouring) which means the sides are not at right angles to each other and are tapered. So the tightness to the oil filter is not so good. I showed it to the mechanic. He said he saw them break when first used. I bought a steel one instead and will be selling it at a flea market for a few bucks.
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