TECOS Allen key set for damaged bolts. A completely new patent designed to dismantle damaged Allen bolts. The tool is able to dismantle a bolt that has no hexagon left. What previously meant that you had to drill out the bolt and then insert an insert thread is now solved in a few seconds. The kit contains 9 parts : 1.5 - 2 - 2.5 - 3 - 4 - 5 - 6 - 8 and 10 mm