tends to run out of the bore hole 19 through the clearance between the rod 3 and the wall of the bore hole the counterclockwise helical channel 15 will partially restrain the downward flow of the adhesive and drive the same back towards the end of the bore hole assuring good adhesive contact between the section adjacent the end of the rod 3 and the wall of the bore hole when the support plate 25 is flush with the surface of the roof structure 21 the adhesive 29 will set such adhesives generally setting in about a 15 to 20 second time period with the head 7 and flange 9 of the rod fixing the support plate 25 to the surface to support the mine roof as shown in fig2 the cutting edges 13 formed by cutting the groove 11 in the end of the rod 3 are beveled as at 31 with a beveled surface of about 15 u00b0 from the surface of the rod to the groove being preferred a preferred embodiment for use with a 7 8 34 diameter rebar provides that the groove 11 be about 1 2 34 wide and between 1 2 34 to 3 4 34 deep in.