Novus B50 Heavy Duty Stapling Up to 140 Sheets: Anti-blocking system (ABS) for convenient, trouble-free staplingFull-metal device in plastic casingVariable throat depth (up to 75 mm)Staples use: 23/10, 23/13, 23/15, 23/17 Express fault-clearance for blank stapling shot when requiredPress button loading system with double, spring-mounted