PB Swiss Tools PB 212LH-10 BL Private Wrenches blue Personal Sets - all sizes in the same color for assembling private tool sets. Only Ball Point Hex Key manufactured with 30+ degrees of movement and perfect dimensional accuracy. PB's spring steel, despite a hardness of 58-60HRC, allows toughness/elasticity in its hex keys. All PB Swiss Tools are 100% Swiss-made. Every PB Swiss Tools product comes with an unlimited lifetime guarantee.