When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Even if it doesn't trap occasional metal fall out, they are handy due to the fact that they tend to stick to the oil pan right after removal.
I have a tendency to drop mine into the bottom of the oil receptacle.
Also, they nearly always have a bunch of very fine, particulate that I can clean off, which is satisfying for some reason probably associated with OCD.