Cách sử dụng
"Countersunk" is a word used to describe the shape of a hole in which a screw or bolt can be placed. When a hole is countersunk, it means that the top of the hole is wider than the bottom. This makes it possible for the head of the screw or bolt to fit snugly into the hole and sit flush with the surface it is being screwed into. This is useful for things like woodworking or metalworking, where you don't want screws or bolts sticking out and getting in the way.