The window frame screw FBS-Z 7,5-72 socket head (Ø 8,3 mm, TX30) is suitable for constraint force free distance mounting. A special zinc plated thread at the screw tip with reduced diameter reduces the setting torque and therefore allows a longer battery life of your cordless screwdriver. For quick and easy installation of many different window types in a large number of base materials. FBS-Z is recommended for installing wooden window frames. In this process the external underhead milling ribs ensure flush finishing in all common frame materials.