Headcote SS Trim Head Screws - Contractor Pack is designed to blend with all types of wood decking, including cedar, ipe, mahogany, and meranti. These premium quality deck screws feature extra deep star drive recesses, type 17 auger tips, and trim or reinforced flat heads. For applications exposed to salt air, near large bodies of water, swimming pools or other areas where corrosion is more likely to occur, use Marine Grade 316 Headcote or Marine Grade 316 Deckfast Stainless. They are also available collated for use with the Muro Ultra Driver tool.Headcote 305 and 316 screws match the profiles of Smart-Bit Pre-drilling and Countersinking Tools. For materials that require pre-drilling, especially hardwoods, this product combination makes it easy to achieve a clean and professional finish.