PB Swiss Tools SwissGrip Hex Key Screwdriver size 1.5mm PBs spring steel, despite a hardness of 58-60HRC, allows toughness/elasticity in its screwdrivers. The handle, made of Santoprene, is friendly to the skin and gives you a soft and warm grip feeling. Non-slip grip, even with wet hands. Color coded with symbol and size printed on end of handle. All PB Swiss Tools are 100% Swiss-made. Every PB Swiss Tools product comes with an unlimited lifetime guarantee.