Crown sizes are typically segmented into wide, medium and narrow designations.some staples come with a flat top, while others have a round or "U-shaped" crown.
staples are categorized by different wire gauges or thicknesses. Gauge is determined by the wire diameter, It might seem counter-intuitive, but the thinner the wire, the higher the gauge number.
leg length can vary significantly - even within the same series of staple.Leg length requirements vary by application type, as well as the base material you are driving the staple into. The staple has to be able to fully penetrate and clasp to form a tight bond.
Most staple series are determined by the staple's crown size (width) and gauge (thickness).
In order to consistently get the right staples for your tool, rely on the staple gun itself. More often than not, staple dimensions are printed on a staple gun's magazine.
Pro Tip: Never try to force a staple into the wrong tool. Not only can this create a jam, but it could break the staple or damage the tool.