World Class Socket Sets. Kincrome LOK-ON™ Sockets, Sets and Accessories have been engineered beyond world-class benchmarks, exceeding all international torque and lifetime standards. Offering unique patented features such as the LOK-ON™ Socket's ability to loosen up to 85% rounded/damaged fasteners, the LOK-ON™ range has been developed with both function and style in mind. Each component within the LOK-ON™ range includes features above and beyond the market's expectation, setting a new benchmark for the professional quality tool industry.