Clamp with strong suction cup on the back. Reliable grip on smooth surfaces, no drilling required. Suitable for hanging, for example, information and indication signs or decoration purposes. Clamp made of sturdy steel with extremely powerful double steel spring. Fixing to the wall using negative pressure. Adhesive force: approx. 1kg. both vertically and horizontally. Suction cup Ø 4cm. 3 year warranty .