You're trying to pin down insulation, a thin plastic sheet, or a cardboard backing and your standard staples keep tearing through or just won't bite. That's the 140/12mm flatwire staple doing what it should: precision-cut legs dig in clean, the wider crown grips the surface so nothing pulls free, and the galvanised wire shrugs off the moisture that'll rust a cheap staple in a week. Two thousand per box means you finish the job without running back to the shelf. Grab a box, load your stapler, and get on with it