Features SPECIFICATIONS: 1/4in hex shank screwdriver bit holder, including 5 socket extension bars of different colors and metal keyring, convenient and practical. GOOD COMPATIBILITY: Compatible with most 1/4 quick hex handle and 1/4 hex socket, as well as various electric screwdrivers, hand screwdriver and drill bit. METAL MATERIAL: The extension bit holder is made of excellent metal, the chrome plated surface is rustproof, corrosion resistant and oxidation resistant. WITH KEYRINGS: Each socket is provided with a keyring, and hung on a keyring to prevent it from falling, which is helpful for high altitude operation. PORTABLE DESIGN: The keyring screwdriver bit holder is portable design, and the socket surface is knurling texture design, which is non slip and durable. Specification:Item Type: Hex Shank Bit Holder Inner Diameter: 1/4in (6.35mm) Socket Extension Bar Length: Approx. 3.4mm / 0.13in Socket Extension Bar Outer Diameter: Approx. 1.6mm / 0.06in Keyring Diameter: Approx. 25mm / 1in Specification: Keyring, Red, Yellow, Blue, Green and Black Sockets(Grid Pattern Knurling) Package List:1 x Bit Holder (With Keyring, Red, Yellow, Blue, Green and Black Sockets) Package List 1 x Bit ​Holder (With Keyring, Red, Yellow, Blue, Green and Black Sockets)