The Wera 05066780001 Screwdriver bit is a Tri-Wing® type TW4, with an overall length of 50mm. It is designed with the specific appearance of a Tri-Wing® fastener, which is a three-pointed screw head design. It is designed specifically for use with specialized tool applications, like precision equipment, mobile phones and digital cameras, and its corresponding screws. It is made of high-quality, hardened steel and is highly resistant to wear and rust. It is also made to a precise tolerances to ensure a secure fit and superior performance. This screwdriver bit is compatible with all manual and electric screwdrivers, as well as with system 4, 4Z, 5Z, and 6Z from Wera.