The blade is made from high grade silicon manganese steel. It is full hardened and tempered withstand high torque requirements and magnetized to lift screws etc. From confined spares or to hold screw in position. It is also effectively protected against corrosion by nickel chrome plating. Taparia offer the most comprehensive range of screw drivers: -Made out of high grade steel and transparent green cellulose acetate handle. The handle is made from high grade c. A. Plastic which is non flammable and unaffected by oil petrol, grease, water etc. It is available in wide variety of different tip size and length. It is generally conforming to is 844-1979.