SwissGrip screwdrivers for slotted screws parallel tip, optimum transmission of force, no cam-out convex handle with soft surface, pleasant grip and high torque transmission color coded by handle size, easy identification high-quality materials used, resistant to solvents, oils, acids and salts special alloy based on spring steel, exceptional elasticity coupled with with high hardness laser-marked serial number, lifetime guaranteeメーカー公称