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.