Features:  Made of quality S-2 steel material, high hardness and high strength, wear resistance and can provide long service time.  Manufactured with quenching heat hardening process for maximum accuracy and stability.  High precise concentric shaft design for easy centring, sandblasting surface, prevents slipping, not easy to break.  Humanized design, these bits are designed with magnetic, strong magnetism, easy to absorb and take screws.  3 set of specifications available, with high drilling efficiency, 12pcs 50mm, 11pcs 75mm and 11pcs 100mm, you can choose according to your demands.  Suitable for home, auto repairs, electrical repairs, electronic product repairs, machine repairs, etc..  And you can use it with electric drill, electric screwdrivers and impact screwdriver.    Specifications:  Name: Electric Drill Bit Set  Material: S-2 steel  Type: 12pcs 50mm, 11pcs 75mm, 11pcs 100mm (optional)  12pcs 50mm: T5, T6, T7, T-8, T9, T10, T15, T20, T25, T27, T30, T40  11pcs 75mm: T6, T7, T-8, T9, T10, T15, T20, T25, T30, T35, T40  11pcs 100mm: T6, T7, T-8, T9, T10, T15, T20, T25, T30, T35, T40  Item weight:  12pcs 50mm: 105g / 3.70ounce  11pcs 75mm: 135g / 4.76ounce  11pcs 100mm: 170g / 6.00ounce  Package size:  12pcs 50mm: 70 * 70 * 15mm / 2.76 * 2.76 * 0.59in  11pcs 75mm: 120 * 70 * 15mm / 4.72 * 2.76 * 0.59in  11pcs 100mm: 120 * 70 * 15mm / 4.72 * 2.76 * 0.59in  Package weight:  12pcs 50mm: 110g / 3.88ounce  11pcs 75mm: 140g / 4.94ounce  11pcs 100mm: 175g / 6.17ounce    Packing List (12pcs 50mm, 11pcs 75mm, 11pcs 100mm OPTIONAL):  1 * Electric Drill Bit Set