The E420 clamping screw insert is an adapter for screwing tools to enable SX construction screws with irius® drive to be set quickly and efficiently. The positive connection via a tooth-shaped ring between the screw insert and the screw ensures that the screw is held absolutely securely in the adapter and that effortless screwing is also achieved even under unfavorable installation conditions. In the event of the screw slipping off the profile, it remains securely in the screw.