Description: Sturdy and Durable: Polished, chrome plated finish, highly strength. Material: Steel made, high hardness, wear resistance and ensure longevity. Usage: Precisely and machined bit tips to ensure accurate size, wide Application for any electric drill, screwdriver, mechanical maintenance. Easy to Install: Just one minute to complete the installation. Set includes a organizing case for storage and easy carrying. Quality: It is made from steel, which greatly improves the strength and abrasion resistance of the workpiece. Specification: Material: Steel Size Chart: Optoinal: 6.3mm Short Interface : 1/4Inch, Sleeve: 5/6/7/8/9/10/11/12/13/14mm, Total Size: 26cmx4.5cm/10.24inchx1.77inch 10mm Short Interface: 3/8inch, Sleeve: 8/10/12/13/14/15/16/17/19/22mm, Total Size:33cmx5.5cm/12.99inchx2.17inch 12.5mm Short Interface: 1/2inch, Sleeve: 10/12/13/14/15/16/17/19/22/24mm, Total Size: 5cmx5.5cm/13.78inchx2.17inch 6.3mm Long Interface: 1/4Inch, Sleeve: 5/6/7/8/9/10/11/12/13/14mm, Total Size: 26cmx7cm/10.24inchx2.76inch 10mm Long Interface: 3/8inch, Sleeve: 8/10/12/13/14/15/16/17/19mm, Total Size: 31cmx9cm/12.20inchx3.54inch 12.5mm Long Interface: 1/2inch, Sleeve: 12/14/17/19/22, Total Size: 24.5cmx10.5cm/9.65inchx4.13inch Package Includes: Optional Interface  Socket Wrench Head Set