A cylinder is usable for processing flat material and includes a cylindrical body, which can be rotated about a cylinder axis, and at least one group of a plurality of tools. These tools perform a working movement in relation to the cylindrical body and are coupled to first and second control levers. A fixed cam plate is followed by the first control lever of each tool. A rotating cover disk is followed by the second control lever of each tool. The cover disk comprises a plurality of congruent sectors each having at least one section with a first radius which allows that tool to accomplish its working movement. The cover disk sectors each also have at least one section with a second radius which blocks the working movement of the tool.