These Brass Phillips Drive Flat Head Wood Screws are made of Grade 360 brass, are corrosion resistant. and aesthetically pleasing. These fasteners are the choice for antiques, doll houses, miniatures, boats, jewelry boxes, and all other projects requiring an old fashioned appeal. the fasteners offer Rolled Threads with a single edge. Single lead threads are preferred where the nominal length of the screw is shorter than 4 times the basic screw diameter.