GearWrench 81344 1/2” Drive Wobble Extension 3” The GearWrench 1/2” Drive Wobble Extension features a knurled grip that provides a non-slip surface, and a full polish chrome finish that cleans easily and resists corrosion The GearWrench 1/2” Drive Wobble Extension can be used as either a Standard Extension when fully inserted into the socket or as a Wobble Extension when partially inserted.