A self-drilling anchor for use in a friable material comprises a body having an axis, a flanged rear end, a drilling front end and a generally cylindrical portion therebetween having an outer surface with a thread disposed thereon, wherein the body forks, beginning at a predetermined distance from the flanged rear end, into a first leg and a second leg, the first leg extending forwardly into a drilling tip, wherein the first leg may have a generally rearward facing shoulder angled obtusely outwardly with respect to the axis, wherein the body has an axial bore for receiving an elongate fastener, the axial bore extending substantially through the flanged end and leading to the generally rearward facing shoulder, wherein the anchor is adapted so that the first leg pivots apart from the second leg when the elongate fastener deflects the generally rearward facing shoulder and the predetermined distance is selected to increase pullout strength when the first leg is pivoted apart from the second leg and the anchor is installed in the friable material.