Designed for a variety of tasks, the Wera 05071074001 Torsion Bit is a versatile tool. It has a hex shank and can be used with most insert bit holders. This 1" long stainless steel bit has an overall length of 1", making it suitable for most applications. Its 4mm fastening tool tip size makes it perfect for screwing or unscrewing bolts and screws in tight spaces. The hex shank is compatible with most insert bit holders and allows you to adjust the fit of the bit in the holder. If you need a versatile screwdriver that will help you get your job done faster, this Wera Torsion Bit is what you need.