No Pre-drilling Required! The DHSD screw (model SSDHSD50TR250) is specially designed to penetrate the hardest timber decking products with ease. Its unique drill point virtually eliminates countersinking and splitting without pre-drilling, a huge time saver. The DHSD is suitable for fixing decking to both hardwood and softwood joist. Low torque design for easy driving. Raised countersinking head delivers a professional and decorative finish. Unique ribbed shank provides greater strength and holding power. Made from 316 Stainless Steel, this is a marine grade screw, ideal for all applications, coastal or inland.