This 2-pack of the 1/4"-20 Male to 3/8"-16 Male Hexagon Screw Adapter from CAMVATE can be used in various on-set applications to convert female threads to male. Each adapter allows you to convert a 1/4"-20 female thread to a 3/8"-16 male, or a 3/8"-16 female to a 1/4"-20 male.