Engineered for impressive performance, the PowerCrown staples feature a unique crown at the top of the staple that flattens during stapling. Forced outward, the legs are better supported by the stapler magazine throughout the drive, resulting in more stapling force and reduced staple buckling. Staples are made from superior-quality, high carbon steel wire with finely chiseled points for maximum sheet capacity. Standard leg length is 3/8" (9mm). Each full-strip contains 210 staples. Use when stapling more than 20 sheets in Bostitch models: B8 Impulse 45 Electric (B8E-VALUE), B8 Xtreme Duty Plier (B8HDP), and B8 Heavy-duty Plier (02245).