Performance Tool 47-piece socket and bit sets feature drop forged carbon steel construction with a corrosion-resistant chrome plated finish. The sets include a wide range of standard sockets and bit sockets in SAE and metric sizes. Together with the 1/4 in. drive round head ratchet, 1/4 in. drive 3 in. extension, and 1/4 in. drive spinner handle, these socket and bit sets provide a comprehensive nut, bolt, and screw driving system.