The Klein 32539 is a 10-fold screwdriver/nut driver that contains 5/16-inch & 1/4-inch nut drivers, .9 mm, 1.3 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, and 5 mm metric hex. Due to its folding pocket-style design, it allows you to easily access and store it while on the jobsite. It unfolds and locks at a 180-degree angle, providing a straight screwdriver and nut driver. Its blast finish steel bits also gives a strong hold to the fastener. Klein Tools has achieved a lot through the decades as they continuously manufacture best and quality products for their customers. Whatever tools you need, Klein has it for you. Get their products now here at PlumbersStock!