Concealed Mounting - For 1-3/4" Wood and Metal Doors Line DrawingPartDescriptionMounting Type SP1039 1/4 - 20 x 1/2" Cone Head MS 6/6R SP1058 5/16 - 18 x 1/2" Cone Head MS 6HD SP1051 1/4 - 20 x 1/2" Double Cone Head MS 17/17R SP1059 5/16 - 18 x 1/2" Double Cone Head MS 17HD