Abstract: A holding device comprising two clamping members (10, 11); a hinge portion (16); and a spring element (24); wherein all the aforesaid parts are integrally molded from a plastics material and the spring element is connected to one of said clamping members by a mounting portion (25) of sufficiently small cross section to enable the spring element to be molded in a position in which apart from said mounting portion it is clear of said clamping members (10, 11), and thereafter can be moved about said mounting portion (25) to an operative position in which it spring biases the clamping members (10, 11) relative to one another.