GREX patent pending auto-fire speed dial allows the GREX 80AF fine wire stapler to shoot one staple or rapid-fire several staples per single trigger pull. Turning the auto-fire speed dial counter-clockwise (towards A - Automatic) increases shots per minute and turning the auto-fire speed dial clockwise (towards S - Single) reduces shots per minute. For projects requiring a slightly heavier thin-wire staple with a wider crown, the GREX 80AF fine wire stapler conveniently uses a 21-gauge 1/2 inches crown staple with lengths ranging from 3/16 inches to 5/8 inches. What's more, the 80AF is available in four different designs: 80AD (industry standard), 80ADLNS (long nose - projects requiring a longer reach), 80AF (auto-fire - speed of production), and the 80AFLM (auto-fire long-magazine - less reloading for continuous speed of production). Suggested applications: Upholstering, carpet laying, light wood assembly, display and sign work, luggage construction, silk screen assembly, home building applications, applying drapery fabric to cornices, sign shops, box spring and mattress covers, automobile interior, installation of light trim moldings, light gauge metal piercing, roofing paper, etc.