Abstract: There is disclosed screw adapted to fasten two or more juxtaposed workpieces which comprises a threaded shank defining an axis and a major thread diameter. A drilling tip is provided which extends from the shank and includes a pair of cutting edges. Material removing extensions are formed continuously with the cutting edges and serve to extend the cutting edge in the radially outward direction at least as far as the radially outermost extent of the major thread diameter. The extensions are frangible and will fracture when a material of predetermined hardness is encountered. As such the fastener is adapted for drilling a first, enlarged bore in a first workpiece of relatively soft material, and a second smaller bore in a second workpiece of a harder material, such as metal, or the like.