Bostitch® SB35 Premium Heavy Duty Staples, 13/16". These Premium Heavy Duty Staples were developed for optimum performance in most Bostitch® heavy duty staplers. Constructed from superior quality high carbon wire to reduce buckling and jamming. The finely honed chisel points deliver maximum penetration for maximum sheet capacity. Optimized 13/16” (20mm) leg length to drive through a sizable 130-165 sheets. 1,000 staples per box.