Abstract: A clip comprising two half bodies of a symmetrical structure, and two inverted U-shaped clasps combined together, each half bodies having two clasp openings spaced apart in an upper lengthwise edge for the two clasps to fit and catch hold of a vertical sloped wall in each clasp opening, the two half bodies being able to be pressed inward at their heads to open a normally closed lower sides and then to be closed by elasticity of the two clasps when the heads are released.