HSS quality, ideal for metal, plastic, wood. Supplied in a practical case.With two of each drill bit: 0.6 - 0.7 - 0.8 - 0.9 - 1.0 - 1.1 - 1.2 - 1.3 - 1.4 - 1.5 - 1.6 - 1.7 - 1.8 - 1.9 - 2.0 - 2.1 - 2.2 - 2.3 - 2.4 - 2.5