The Tolsen 20051 is a versatile set of 10 hexagonal keys designed for tightening and loosening hexagonal mounting screws in both home and professional settings. These tools are crafted from chrome vanadium steel, which provides the necessary durability and strength to handle repetitive mechanical tasks without wearing down quickly. The set includes a comprehensive range of sizes, from 1.5mm up to 10mm, specifically 1.5, 2, 2.5, 3, 4, 5, 5.5, 6, 8, and 10mm. To keep your workspace organized and ensure you always have the right tool at hand, the keys are conveniently held together on a sturdy ring.