Powerbuilt Zeon hex bit sockets are designed to grip and turn damaged and rounded hex head fasteners. The patented design will grip and turn hex surfaces up to 85% rounded. And they work just as well on new fasteners. If you’ve got a hex head bolt or cap screw bolt that’s too damaged to turn with a regular hex bit socket or hex key wrench that you can’t turn or a nut with rounded corners, we have the help you need. The secret is the patented Zeon bit socket design – the more you turn them the harder they grab and hold damaged hex heads. Zeon bit sockets are constructed of hardened S-2 Chromoly steel for maximum strength and durability.