Device for fastening elements together

A device for fastening together a plurality of elements in which each element has an upper surface and a lower surface and a bore extending therebetween, the device comprising a base plate adapted to be located against a ground surface and to be positioned below and against at least part of the lower surface of each element, a plurality of projections extending from the base plate, one said projection being adapted to pass at least partially into the bore of one said element, and another said projection being adapted to pass at least partially into the bore of another element, and a plurality of fasteners, each fastener being engageable with a respective projection to fasten a said element to the device, wherein each projection is hollow, includes an open top and comprises a plurality of outwardly deformable fingers and each fastener comprises a plug which can be pressed between the fingers to cause the fingers to deform outwardly to grip walls of the bore of the element thereby securing the element to the device.