Flex features locks in place. 180 degree flex range. 72 tooth design delivers a 5 degree swing arc. Packaged in a molded plastic case. Lifetime warranty9 Piece set featuring a convenient locking system whereby locking the flex feature in the desired position, it makes it easier and quicker to place and remove when you need access. Sizes include: 5/16", 11/32", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16" and 3/4"