Light duty staple guns load three sizes of staples: 1/4, 5/16- and 3/8-inch staples.Click to see full answer. Similarly, what size are staple gun staples?It might seem counter-intuitive, but the thinner the wire, the higher the gauge number. The smallest gauge staple wire we carry here at Nail Gun Depot is a 23-gauge staple for upholstery applications, while the largest is 9 gauge for wire fence building.Likewise, can you use regular staples in a staple gun? They are, however, extremely useful, and are safe to operate if you use them properly. They can penetrate thick or dense materials that a normal office stapler cannot. Most staple guns use a trigger at the top of the gun to propel a staple with force from the bottom of the gun. Insert a row of staples into the tray. Keeping this in consideration, how do you measure staples for a staple gun? Most staples have two reference numbers that are normally standard throughout the brands. The first digits, i.e. 24/ or 26/ indicate the gauge of the wire, the thickness. The second number reflects the length of the staple leg, or shank, and is measured in millimetres.How do you read staples sizes?Most manufacturers imprint the staple size that the product accepts on the bottom. The size is usually expressed in the metric, two-number form, such as “23/8.” This means that the gauge or thickness of the staple is 23 (the higher the number, the thinner the staple) and the length of the shanks is 8 mm.