The two metal parts of the cutter are connected with a screw. As I opened and closed the cutter, the screw that holds the two parts together started to loosen, resulting in the two metal parts of the cutter becoming dangerously loose and causing problems with its functionality. You need a screwdriver to tighten the screw. If you solve this problem, as I did by applying a little Teflon or silicone to the thread, the holding screw will not loosen and the tool, which I bought for around 11 euros, will be worth five stars.