8 pieces Hex Key Set 1/4 in, 1/8 in, 3/16 in, 3/32 in, 3/8 in, 5/16 in, 5/32 in, 7/32 in Ball End. Hexagon keys are packaged within a smart, compact wallet that has been designed for ease of key selection and organisation. This set of hex keys is long reach, making them the perfect solution to reach deeply in-set bolts. These L-shaped hand tools are used to tighten or loosen fasteners and fixings with a hexagonal configuration. The spherical head allows for quicker and easier screwing with a tilt angle up to 30°.