LINK Tools offers a 100 percent made in America BLACK KNIGHT tool line. They were developed in response to a request for very low profile locking tools made on behalf of the U.S. military. Because they are slimmer than the base of even the smallest socket, they successfully reach into tight spaces not accessible with other tools. Still, BLACK KNIGHT tools are exceptionally strong and are certified to Aerospace and ANSI strength standards. They deploy a state-of-the-art locking technology. The revolutionary, patented, spring-loaded locking plunger creates a wedge effect when a pull force is exerted on the socket or tool attachment, thereby providing many times the holding force of the standard spring-loaded ball detent of old-style tools. They are available in different drive sizes and are chrome-plated with knurled, titanium-coated quick-release collars at every connection. For more information visit www.linktools.com or call (888) 433-4234.