Includes versatile wide gate hooks and attaches via heavy-duty webbing , These suction cups stick to smooth fiberglass surfaces like glass, boats, SUPs, and campers Versatile Usage - perfect for tie applications where there isn't an anchor , cleat or other device to anchor conventional tie downs. Suitable for smooth surface - These do stick and hold wonderfully on a smooth surface (like a car or glass), however, any plastic surface suction cup will not stick if there is any texture to the surface whatsoever. It's the nature of the . If can get in, the suction will not hold because it relies on creating a vacuum. No Residues - No Glue -Strong Sticky is added to the suction cup to stronger hold. The suction cup will in cold or hot environment. Long Lasting hold, will not come off until you remove it. very strong grips on smooth surface. Control: Non-automatic colour:Black Material:plastic Package Contents: 1 set x Sucker Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.