GRK is the leading provider of high quality screws. With a variety of screw types like deck screws, vinyl siding screws, shim screws, and more, GRK offers the complete package. With quality being of utmost importance, GRK is leading the industry with its recent AC-257 approval. With other technologies like our ZipTip and ClimaTek coatings, you can rest assured that whats holding your products together will not fail like traditional fasteners.