This Draper 400mm - 600mm 1/2" Square Drive Extending Flexible Handle is manufactured from chrome molybdenum steel that is hardened, tempered, chrome plated and polished for corrosion protection. Featured is a hinged joint head and knurled grip for ease of use. The extending handle locks in any position between 400mm (minimum) and 600mm (maximum) and is carbon steel hardened, tempered and chrome plated. A sring-loaded ball bearing is featured for secure socket holding.