CONTENT - Step Key with 5 steps 3/8, 1/2, 3/4, 1-1/4 inches, 21 mm and continuous groove. APPLICATION - Installation and removal of radiator valve, return fitting, tap extension, thermostat, drain fitting. Due to the special design of the step wrench, no tilting in nipples and screw connections is possible. DRIVE - Square drive 12.5mm (1/2 inch) internal. Direct 1/2" square drive eliminates the need for an adapter. The bolt wrench can be directly mounted on a 1/2" ratchet. MATERIAL - The article is made throughout of our Q-30 steel. The quality grade Q-30 is a chrome vanadium steel for optimal dimensional accuracy and high hardness values. WIESEMANN 1893 - quality tools for DIY enthusiasts and tradesmen. With over one hundred years of tool tradition, Wiesemann is one of the oldest producers of tools in Germany. WIESEMANN 1893 represents traditional German quality with modern online distribution., Manufacturer: THE FABELHAFT GROUP