When we install sign letters, direct mounted letters and pin mounted letters are the two most popular installation techniques. Direct mounting means using double-sided tape. When double sided tape is not appropriate, mounting hardware including pins will be installed on the back of the letters and then will be inserted into pre-drilled holes in the wall. These can also be stood off walls thanks to the pin-mounted letters, giving them even more depth. In these cases, spacers of various lengths will be added to the pins so that the letters can be offset from the wall.