Heavy Duty Novus B50 Staling for Up to 140 Sheets: ABS (anti-blocking system) for easy, hassle-free stapling device made entirely of metal with a plastic shell Depth of throat variation (up to 75 mm) Use of staples: 23/10, 23/13, 23/15, and 23/17; when necessary, provide fault-clearance for blank stapling shots. Press-button loading mechanism featuring two spring-mounted