Specialised screw for window mounting

The CELO window frame screw FBS with countersunk head and FBS-Z with socket head are suitable for constraint force free distance mounting. A special thread at the screw tip with reduced diameter reduces the setting torque and therefore allows alonger battery life of your cordless screwdriver. For quick and easy installation of many different window types in a large number of base materials. Both countersunk and socket head have external underhead milling ribs for flush finishing in all common frame materials. FBS is recommended for installation of metal and plastic window frames. FBS-Z is recommended for installing wooden window frames

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