premium quality: eastvolt socket set are made of heat treated and forged chrome vanadium, which can withstand more torque and ensure longevity; premium black phosphate finish also prevents it from rust and corrosion laser etched size: each socket has highly recognizable size markings on their body, which help customers to read and select the correct size for working, even in the dim light wide application: the 72 teeth reversible ratchet ensures smooth ratcheting in both directions and precise adjustment, making it work with limited spaces. the extension bars can access hard-to-reach fasterners easy storage: its sturdy blow molded toolbox makes the sockets easy to store and carry. with compact slots, it also enables to keep every pieces in place tightly