An attachment device (10) for connecting a mop head to a pole comprising a collar (11) and a boss (12) extending upwardly from the collar. A plurality of slots (14) extend vertically through the boss wall, the slots (14) being bridged by bridging nuts (15). This arrangement allows the diameter of the channel (13) defined by the boss (12) to be resiliently increased in order to accomodate poles of differing diameters within the channel (13)
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