Features: * Industrial chrome molybdenum steel is used for forging, heat treatment, high hardness and impact resistance. * Strong twist, thicken design suitable for power and pneumatic tools, strong impact resistance. * Phosphate treatment for surface polishing makes it has great erosion resistance.* Simple structure and beautiful appearance. Specification:* Material: Chrome Vanadium Steel* Color: Black* Size: 1 x 1/2 Inch Universal Joint Swivel Socket Adapter 1 x 3/8 Inch Universal Joint Swivel Socket Adapter 1 x 1/4 Inch Universal Joint Swivel Socket Adapter 1 x 3/8 inch (F) to 1/4 inch (M) reducer 1x1/2 inch (F) to 3/8 inch (M) reducer 1x1/4 inch (F) to 3/8 inch (M) adapter 1x3/8 inch (F) to 1/2 inch (M) adapter* Hardness: 60HRC* Quantity: 7pcs* Perfect tool for mechanics, engineers, carpenters or DIY enthusiasts Package content: 7pcs socket adapter Note:1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.2. Please allow slight manual measurement deviation for the data.