The Big Horn Aluminum Dual Marker/Carpenter Pencil Holder features a unique dual design that enables it to firmly hold the no. 200 and 500 lumber crayon and pencil. Manufactured from aluminum alloy for durability and lightweight for ease of use and comfort. Equipped with an adjustable locking ring to firmly hold crayon/carpenter pencils in place. Dual function design is held together two strong magnets on each side that allow this to be held separately for two different uses. The must have marking solution that every engineer, carpenter, framer, craftsmen, handyman, and all general applications.