Heat treated Chrome Vanadium Steel ensures durability and extreme torque strength. SuperKrome Plating delivers toughest finish with high polish plating which results in jewelry-like finish providing long life and maximum corrosion resistance Comes with a professional thumbwheel ratchet. 160-position ratchet realizes a 2.25 degree swing arc to turn a fastener in tight space with ease. Thumbwheel design enables you to tighten or loosen fasteners with a flip of thumb Including 15 pcs metric shallow sockets 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24 mm, 10pcs deep sockets 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 mm, 13pcs SAE shallow sockets 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8, 15/16, 1, 1-1/16, 1-1/8 inch and 10 pcs SAE deep sockets 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8, 15/16 inch A universal joint provides a secure connection with the drive tool. With 2 extension bars(3 "&5 ") in this set, you can access to hard to reach areas and flexibly change angle, saving time and labour, making job more efficient EVA foam storage tray to keep all these tools organized. High visibility size markings for easy tool identification.