D 21 1.7/8AF D 21 2.1/16AF D 21 2.1/4AF D 21 2.13/16AF D 21 2.15/16AF D 21 2.3/16AF D 21 2.3/4AF D 21 2.3/8AF D 21 2.5/8AF D 21 2.7/16AF