Made of stainless steel, has high hardness, durability and rust-proofing. Makes you align dowel holes in drilled parts to accurately mark drill location in mating material. Accurately marks location of dowel holes or existing pins location in second board being joined. The dowel centers can be used to install and locate cabinets, bookshelves, and other wooden boards, necessary for carpentry Just drill a set of holes, slide in the center of the pin and press the joint together. The pins on the dowel centers will precisely mark the positions of the holes on the other side.