Our nut grip sockets are unique to Ko-ken and truly a revolutionary way of approaching this type of socket. Our fastener holds nuts and bolts in place without the use of magnets. Our system is built with a spring ring and ball bearings on opposing flats. When a nut or bolt is in the socket the ball bearings push out on the springs holding the nut/bolt in place. Our nut grip sockets can completely change a mechanics efficiency. If you lose a nut or bolt inside of an engine it can be quiet the headache to retrieve. With nut grip sockets that dilemma is completely eradicated.