The manual paper cutting machine is for cutting the A3 paper and card into half or smaller sizes (17" inches cutting width). The adjustable side and firm clamping system assure a clean straight cut every time. You also can use it as a desk top cutter. The blade on this unit is a hardened steel, razor sharp, 17" blade. It will easily cut 80g paper, 400 sheets high or approx 1.5". However, should you ever need to replace the blade, this cutter is designed so that it is very easy to do. The heavy duty paper cutter has an easy replaceable blade. Simply use the included blade splint to hold the blade while you remove the screws that hold the blade in place. The blade comes right off and a new one can be put on just as easy. It is ideal for offices, schools, churches, businesses, printing houses as well as professional individual users. Reminder: The speed of which the consumable parts ware down is related to how frequent and what the machine is used for, extensive use may cause the cutting efficiency to be effected. Fix: Either remove and sharpen the blade or if a replacement is needed, feel free to contact Flexzion customer service.