Hazet Square Drive Wobble/Socket Extensions, 1/4in and 1/2in - Hazet 871-4, The Hazet 871-4 1/4in Square Drive Wobble Extension 55mm is manufactured using chrome-vanadium and features a ball shaped, conical outside square drive allowing 8° angular movement to every side. It can also be used as rigid extension - by attaching a socket until its limit stop is reached, the wobble extension may also be used as rigid extension. The flexible shaft allows it to get over obstacles and borders in areas with restricted access. Hazet 871-4 1/4" Square Drive Wobble Extension 101.5mm