It protects fingers and makes it easier to get nails started, and secures a nail (or screw) while keeping it straight and preventing buckling. The strike plate gives you a bigger (and eye-catching) target to aim for. Miss the nail? No worries. The durable holder is made from impact-resistant ABS plastic that can handle a hammer.
The strap-on design fits on left- or right-handed folks and is small enough that it won’t get in your way of what you’re working on. Store it on your hammer between jobs.