Includes – 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 and 24MM)Nut Grip, ¼? drive, Standard Length, Chrome Hand Sockets. NUT GRIP® is Ko-ken’s special design for non-magnetic nuts/bolts to be held firmly in a 6-point socket. The design consists of two balls held in place by a spring steel ring.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 coil spring 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 and engine a lot of time you must take the entire engine apart to find the bolt. With nut grip sockets that dilemma is completely eradicated.Drive Input Size:1/2″Drive Shape:SquareType:Nut Gripper SetIncludes: 2450MS Nut Gripper Sockets:14, 15, 16, 17, 18, 19, 20, 21, 22, 23 and 24MM Rail (150mm long)Warranty: 36500 days from purchase