Bostitch Heavy Duty Premium Staples, 55-85 Sheets, 0.5-Inch Leg, 5,000 Per Box (SB351/2-5M) Can be used with most heavy duty staplers Developed for Bostitch Heavy Duty Stapler Models: 00540 (B00006JNU0), B310HDS (B00006JNU4), &amp; 03201 (B0006HVTRU) Made from superior high carbon wire for reduced buckling and jamming Finely honed chisel points for maximum penetration and sheet capacity 3/8 inch leg length staples 25 to 55 sheets 5,000 staples per box