Made by Chrome-Vanadium Steel that is heat treated, quenched and tempered for optimum strength, torque and ductility for safety and coated with corrosion protected black finish.
Each set has a different color rubber holder firmly holds each key in a sized-marked hole so you always have the size you need at-hand. Exquisite and small size, they can help you to complete more detailed work. Also, they have more exquisite packaging.