The back of this Mezuzah Case build with a Glue stick pad, you may use Nails/Screws, see below
Description: נרתיקי חסין מים למזוזות גודל 15 Mezuzah Holders size 15, in White Plastic Waterproof Mezuzahs with a Rubber plug closerBuilt to fit a Mezuzah Parchment (scroll) of 15 cm (about 6") Box of 25 Mezuzah Cases Nails or Screws is not included, you may purchase it separate see bellow Product of Israel
"stay in touch with us for the right price & true service"