Heavy-duty, premium staples are constructed from superior-quality, carbon steel wire for optimum performance. They are shaped with finely honed chisel points for maximum penetration. Staples are compatible with heavy-duty staplers including Bostitch Antimicrobial 215-sheet Extra Heavy-duty Stapler (00540), Antimicrobial 130-sheet Heavy-duty Stapler (B310HDS), and 60-sheet Heavy-duty Stapler (03201).