Bostitch® SB35 Premium Heavy Duty Staples, 1/4". 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 1/4" (6mm) leg length to drive through 2-25 sheets. 1,000 staples per box. For use in Bostitch Heavy Duty Staplers: 00540, B310HDS, 03201, and other branded heavy duty staplers.