^ThisAnother thing that works really good is a small white hand towel you put in the washroom,the white color makes metal parts standout and they don't roll very far on the either.
I used to use a white towel when I built RC Cars and some have what's called a ball differential and they use really small balls and the towel stopped them from rolling very far and also made them easy to see.
I just use sales papers. They are free and very common.Throwing away your good knife money on store bought mats.... sheesh.
I've been using paper plates. Once used ones at that.