Reliable steel clamp with rotary screw for attachment to the surface at any angle. Place of attachment: door, heating radiator, handle of a window, cabinet door, stair railing, surface of a table, steps of a ladder and so on. Rubber attachments protects surface from scratches when attaching. It is designed for use of level in large areas. It is used for small laser levels with the thread ¼’ and weight no more than 0.5 kg.