Laying out a wall is a job of precision. Keeping the 2x’s straight and level with the plates is a trick to be learned. Keeping your hand out of the way when you pull the trigger on the nail gun is the goal, but having a nail hit a knot and then your finger is something you never forget. The Stud-Spacer is a simple but effective tool to help keep studs lined up, straight to the plate, and your hands out of the shooting zone.