Feature:1. Set includes: 2pcs 1/4\" extensions (3in, 6in); 3pcs 3/8\" extensions (3in, 6in 10in); 3pcs 1/2\" extensions (3in, 5in, 10in); 4pcs impact socket adapters and 3pcs impact universal joints.2. Made from premium chrome-vanadium steel, providing high durability for hard and long-term use.3. Spring loaded detent ball on adapter ends provide secure fit into sockets.4. Knurled handle allows easy comfortable hand non-slip turning loosened fasteners.5. Great for working in hard-to-reach areas, suitable for auto shops, garages and project.Specification:Features:Set includes: 2pcs 1/4" extensions (3in, 6in); 3pcs 3/8" extensions (3in, 6in 10in); 3pcs 1/2" extensions (3in, 5in, 10in); 4pcs impact socket adapters and 3pcs impact universal joints.Made from premium chrome-vanadium steel, providing high durability for hard and long-term use.Spring loaded detent ball on adapter ends provide secure fit into sockets.Knurled handle allows easy comfortable hand non-slip turning loosened fasteners.Great for working in hard-to-reach areas, suitable for auto shops, garages and project.Specifications:Material: Chrome Vanadium SteelColor: SilverSize:1/4": 7.5cm (3in), 15cm (6in)3/8": 7.5cm (3in), 15cm (6in), 25cm (10in)1/2": 7.5cm (3in), 12.5cm (5in), 25cm (10in)Item Weight: 1616g / 3.6lbPackage Size: 32.0 * 9.0 * 3.2cm / 12.6 * 3.5 * 1.3inPackage Weight: 1671g / 3.7lbPackage List:2 * 1/4" Extension Bar (3",6")3 * 3/8" Extension Bar (3", 6", 10")3 * 1/2" Extension Bar (3", 5", 10")4 * Impact Socket Adapter (1/4"F*3/8"M, 3/8"F*1/4"M, 3/8"F*1/2"M, 1/2"F*3/8"M)3 * Impact Universal Joint (1/4"Dr, 3/8"Dr, 1/2"Dr)Package List:2 * 1/4" Extension Bar (3",6")3 * 3/8" Extension Bar (3", 6", 10")3 * 1/2" Extension Bar (3", 5", 10")4 * Impact Socket Adapter (1/4"F*3/8"M, 3/8"F*1/4"M, 3/8"F*1/2"M, 1/2"F*3/8"M)3 * Impact Universal Joint (1/4"Dr, 3/8"Dr, 1/2"Dr)