The bits are forged with chrome vanadium steel material, strong and wear-resistant, with high hardness and long service time. Multi- Specifications design, totally 40pcs of bits with different shapes to meet your different needs. Comes with a plastics carrying box, wear resistant and impact resistant, easy to carry, providing quick and convenient mobility and storage in a complex environment. Features: Forged with chrome vanadium steel material, strong and wear-resistant, with high hardness and long service time. Ergonomic design, easy installation and suitable for operate in small spaces. Multi- Specifications design, totally 40pcs of bits with different shapes to meet your different needs. Twelve point bits are designed to turn the twelve point screws, and with 10mm shank diameter. Inner hexagonal bits are designed to turn the inner hexagonal screws, and with 10mm shank diameter. The clamp rings of socket bits are designed to use with ratchet wrench, easy to convert and widely used. Comes with a plastics carrying box, wear resistant and impact resistant, easy to carry, providing quick and convenient mobility and storage in a complex environment. Specifications: Name: Socket Bit Set Material: chrome vanadium steel Bit: Length 30mm: H4, H5, H6, H7, H8, H10, H12,M5/6/8/10/12,T20, T25, T30, T40, T45, T50, T55 Length 75mm: H4, H5, H6, H7, H8, H10, H12,M5/6/8/10/12,T20, T25, T30, T40, T45, T50, T55 Bits socket: 3/8inch (10mm); 1/2inch (10mm) Package size: 330 * 135 * 38mm / 12.99 * 5.31 * 1.50in Package weight: 1600g / 3.53lb Packing List: 40 * Socket Bit 1 * Plastics Box