This set is made from premium chrome-vanadium steel material, high hardness, wear resistance, and long durability for long-term use. Includes 9pcs extension rods, 4pcs impact socket adapters and 3pcs impact universal joints. Features: Premium material, which are made from premium chrome-vanadium steel material, high hardness, wear resistance, and long durability for long-term use. The human-shaped spring-loaded retractable ball at the end of the adapter can be securely fitted into the socket. 180 angle adjustable knurled handle allows easy turning to loosen fasteners, comfortable and labor saving. 16pcs in a set, with 9pcs extension rods, 4pcs impact socket adapters and 3pcs impact universal joints. Perfect for working in hard to reach areas, suitable for auto shops, garages and projects. Specifications: Material: Chrome Vanadium Steel Color: Silver Package size: 240 * 100 * 220mm / 9.45 * 3.94 * 8.66in Package weight: 1700g / 3.75lb Packing List: 9 * Extension Bar 4 * Impact Socket Adapter 3 * Impact Universal Joint