Bronze Star Corrosion-Resistant Star Drive Screws are for exterior construction applications. Excellent in: hardwood, softwood, chipboard and other tough materials. Accomplish more in less time & eliminate user fatigue with our Bronze Starís key features. Type 17 pre-drilling auger, drag reducing knurled shoulder, self countersinking cutting nibs, proper thread length, maximum holding power and more! Great for all exterior purposes - decking, fencing, siding, and more!