Crescent mechanics tools are made from chrome vanadium steel alloy, specially formulated and heat-treated for high strength and superior resistance to abrasion and corrosion. Specifications1/2 Quick-release ratcheting drive1/2 Extension 125mm and 250mm1/2 Universal joint1/2 Spark plug sockets: 16mm and 21mm - Superlock Sockets: 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 27, 30 and 32mm - Fine tooth ratchet with forward and reverse direction - Cushioned grip for comfortable handling and reduced user fatigue - Supplied in a sturdy plastic case with a padlocking hole - Perfect for handymen, repairmen, construction workers, mechanics, motor vehicles car bicycle repairing and many more - Sturdy storage blow case with designated slots to keep all the tools together, neat and tidy without any chance of losing one of them - Size markings on each socket make it easy to distinguish and select the adequate one before use