torque to the fastener 10 to drive the fastener 10 into the substrate s in some embodiments the outer surface 38 may be polygonally shaped however the outer surface 38 may be any shape that may be used with a variety of tools alternatively the outer surface 38 does not need to be engaged to drive the fastener 10 into the substrate s for example a hole may be pre drilled in the substrate s and the fastener 10 may be driven into the substrate s using a striking tool to strike the protrusion 36 of the head 22 and thereby insert the fastener 10 into the substrate s as described below additional features of the fastener 10 facilitate insertion of the fastener 10 into the substrate using a driving force a top view of an embodiment of the head 22 of the fastener 10 is shown in fig3 by way of non limiting example the head 22 may have a square cross sectional shape having sides extending radially outwardly from the longitudinal axis each side may extend about 0 75 to about 0 81 inches in some embodiments as shown in fig1 and 2 the annular flange 32 extends radially from the.