The Underlayment or luan nailer is auctually a medum duty stapler. This nailer is usually used for installing luan underlayment prior to putting down a vinyl floor, or can also be used in some types of finish work projects where something stronger than a finish nail is sought for.
We carry a variety of staples for these nailers in small packages. Please call to see what we currently have in stock. For other non stock sizes or larger quantity needs, compatible nails are stocked at most home improvement warehouses.