LINK Tools introduces the Black Knight tool line. With a slim base design, these tools successfully reach into tight spaces not accessible with other tools, while still being exceptionally strong and certified to aerospace and ANSI strength standards. The Black Knight design includes a patented, spring-loaded locking plunger that 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. The attachment actually increases when a pull force is exerted rather than the hold being easily overcome and releasing. Made in the USA.