Heavy-duty staples are designed to deliver premium stapling performance. Superior-quality, high carbon steel wire reduces staple buckling and jamming. The finely chiseled points pierce stacks of paper for maximum sheet penetration. Staples are compatible with most heavy-duty staplers, including Bostitch Antimicrobial 215-Sheet Extra Heavy-duty Staplers (00540), Antimicrobial 130-Sheet Heavy-duty Staplers (B310HDS) and 60-sheet Heavy-duty Staplers (03201). The 3/8" (19mm) leg length staples 25 to 55 sheets.