A cutter includes two handles, a blade, a cutting board, an angle holder, two screws, a spring-biased lock and a releasing element. The cutting board is supported on the first handle. The blade is connected to the second handle. The angle holder includes teeth and a cutout. The angle holder is attached to the first handle by the screws. The releasing element is pivotally connected to the first handle and includes a slot. The spring-biased lock is pivotally connected to the first handle. The spring-biased lock is allowed to engage with the teeth or enter the cutout when an end of the slot is placed against one of the screws. The spring-biased lock is removed from the teeth and the cutout when another end of the slot is placed against the screw.