Perfectly paired with our Torque Wrench, these 1/4" drive hex bits come in 3, 4, 5, and 6mm sizes. The socket is made of chrome vanadium steel which is super strong and the bit is of tool steel with an anti-corrosive oiled finish. The entire tool is hardened and tempered for long life and is made according to DIN 7422 standards so you can be sure it's true-to-size.