Description: 【Premium Material Construction】: This hex socket set is crafted from quality alloy steel bits and sockets, ensuring exceptional durability and longevity through forging and treatment processes 【Resistance】: The set features fully polished, chrome plated mirror sockets and zinc phosphate treated bits, providing great resistance for long term performance 【Versatile Application】: Ideal for use with manual tools, this hex bit set includes all essential sizes needed for a variety of tasks involving bicycles, automobiles, home appliances, lawn equipment, machinery, and any other projects requiring hex/allen bits 【Material Composition】: Made from chrome alloy steel to provide strength and reliability during use 【Comprehensive Set Dimensions】: The total length of each piece is 55mm with a square hole inner diameter of 12.5mm and bit length of 20mm; the package includes a 9piece set ranging from H4 to H17 sizes Specification: Material: Chrome,Alloy Steel     Size Chart: total length:5.5cm/2.17inch square hole inner diameter: 1.25cm/0.49inch bit length:2cm/0.79inch Package Includes: 9 Socket Bits   Note: Please allow slightly errors due to manual measurement and different screen.