Tri-lobe handles for comfort and effective delivery of torque. Electro Statically Dissipative to protect sensitive electronic components. Blades manufactured from premium quality chrome vanadium/molybdenum steel for strength. Tips accurately machined for the ultimate screw fit. Set contains slotted 3x75, 3x100, 5x135, PH0x60, PH1x80, PH2x100.