Closing heads type GWW-20 and GWZ-20 are the devices co-operating with different types of closing machines and can be installed in closing machines of following companies ROBAK, ALCOA, STORK, KRONES, NAGEMA, Dr. DATZ, ZALKIN. The heads serve to make the closures of plastic and glass bottles using plastic caps with different number of cuts (notches) dia. 20 ÷ 115 mm. The heads are made completely of stainless steel.