Head Magnetic DesignBlack Screwdriver Tip guarantee long service life, increased corrosion protection and accurate fit into fastener; Excellent Material Insulated Screwdriver Set adopt Chrome Vanadium Steel Blade, stronger and more durable than standard steel, offer more strong torque and resilience to prevent stripping; SafetyEach Insulated screwdriver tool is individually tested and Insulated to 1000 volts AC.; Box Includes. Full size of 4 Slotted Insulated screwdriver 3 x 75mm, 4.0 x 100mm, 5x125mm, 6x 150mm; 3 Phillips Insulated screwdriver PH0 3 x 75mm, PH1 4x100mm, PH2 5.0 x125mm; PH2 6.0 x150mmVoltage Tester(100v-500v testing range); Widely UseThe magnetic tip insulated screwdrivers are suitable for electricians, building computers, and working with breakers or electronics, electrical fields