Abstract: A moulded nylon glass fiber reinforced fixing device has an elongate body with leading and trailing ends, the body comprises two or more similar legs which splay apart to hold the device in position when the leading end is driven into blockwork. Devices shown are rectangular in section with legs defined by slot(s) running partially along the length of the device away from the leading end. One form of device has a slot extending through its thickness defining two legs and another two slots defining four legs. A third has two slots each extending partway through the device from opposed faces and which are parallel and separated by a readily rupturable wall part. A fourth has a slot extending between readily rupturable parts of opposed side walls of the device. Surfaces to contact blockwork may be roughened and surfaces defining slot(s) may have triangular grooves therein.