An assortment of standard hex keys from The Hillman Group. Also known as Allen keys, hex keys are L-shaped tools used to drive bolts and screws that have a hexagonal socket in the head. The contact surface of the screw or bolt is protected from external damage. Variants included in this assortment range from 1/16" to 1/4" in diameter. Full assortments of #4319 contain eight (8) refills comprised of Hillman item numbers #546 - #552 and #4320.