A clamp for a plastics or similar band, such as is commonly used in hospitals to secure to a person an identity tag which is intended to be resistant to removal, comprises a base and a clamping member moulded integrally with a hinging web from synthetic plastics material, the base carrying a post over which one end of the band is impaled and secured by upsetting the end of the post, and the clamping member being hingeable towards the base to clamp the free end of the band which in use is laid across the base. Co-operating lip and tongue means are provided to secure the base and clamping member together in non-releasable manner.