Extra heavy-duty stapler features durable, all-metal construction for superior, heavy-duty stapling performance. No-Jam technology ensures smooth, jam-free operation while nonskid rubber feet provide stability and desktop protection during use. Adjustable paper stop ensures consistently professional staple placement. Antimicrobial protection reduces the growth of bacteria. Stapler fastens up to 215 sheets of paper at a time. It uses Bostitch SB35 Series Premium Heavy-duty Staples in 1/4" , 3/8" , 1/2" , 5/8" and 15/16" sizes. Rear-loading pusher system allows simple staple refill.