These industrial-grade steel wrenches work in tight spots when ordinary allen keys won't. Each has one ball-end, permitting entry angles up to 25 degrees (the other end is standard). This Metric set of 7 includes ball-end allen keys in the following sizes: 1.5mm 2mm 2.5mm 3mm 4mm 5mm 6mm Allen keys come in a handy self-organizing plastic sleeve, with the size of each key clearly indicated - perfect for keeping your toolbox or workbench tidy, and helping you grab the size you need.