Abstract: A clamp for the detachable holding of web-shaped materials, comprising a spring steel clamping strip consisting of two downwardly extending legs having lower free ends and an intermediate section interconnecting said legs at upper ends thereof, a pull bar fastened at one end to the intermediate section and an elongated slide element defining a transverse groove through a portion of said element to define two arms and a longitudinal bore through the ungrooved portion, said bar passing slidingly through said bore and permitting said clamping strip to be completely drawn into said groove to create a bringing together of said legs, the distance between the two arms being less than the distance between the lower free ends of the legs when in an open position, the lower free ends of said legs being bent towards each other and serrated, the legs contacting said arms at only one point when in said groove.