In a device for fastening a perforated block to a metal melt container, the perforated block can be fastened by at least one clamping wedge which can be inserted transversely with respect to its through opening and which has a clamping jaw coupled thereto, wherein this clamping jaw acts on a clamping surface formed on the circumferential surface of the perforated block. The respective clamping wedge is guided in a carrier plate so as to be displaceable in its longitudinal extent or extension and transversely with respect thereto, while the clamping jaw coupled thereto can be moved in this transverse direction. Consequently, the perforated block can be fastened with precise positioning in the carrier plate in a simple manner.