18 / 19 / 22mm: This refers to the leg length (or crown depth) of the staple, measured in millimeters.
This is the most critical dimension as it determines how deep the staple penetrates into the wood.
18mm (~0.7"): A shorter staple. Good for thin fabrics, dust cloths, or attaching cardboard backing.
19mm (~0.75"): A very common, versatile length for general upholstery tasks like attaching webbing,
some fabrics, and trim.
22mm (~0.87"): A longer, heavier-duty staple. Essential for securing high-tension materials like zigzag
springs, thick burlap, or multiple layers of foam and batting.