The Wera 05022089001 Hex Key Set with Holder is a 10-piece set of hexagonal keys and a holder. It is part of the Hex-Plus series and contains nine pieces of size hexagonal keys. All pieces are constructed of durable materials and can be used with a variety of applications. The holder provides a solid, secure grip and is designed for quick access to the keys. The hex keys are designed to reduce torsion and prevent rounding off of the screws when tightening or loosening. This set does not contain any SVHC (Substance of Very High Concern) materials as of July 7, 2017.