Simpson Strong-Tie HDU8-SDS2.5-16-5/8" Galvanized Predeflected Holdown w/SDS Screws Product Description Preselected during the manufacturing process, virtually eliminating deflection under load due to material stretch. Uses Strong-Drive sds heavy-duty connector screws which install easily, reduce fastener slip, and provide a greater net section area of the post compared to bolts. Strong-drive sds heavy-duty connector screws are supplied with the hold owns to ensure proper fasteners are used. From the Manufacturer Simpson Strong-Tie HDU8-SDS2.5 Holdowns are pre-deflected during the manufacturing process, virtually eliminating deflection under load due to material stretch. They come with 2-1/2-inch Simpson Strong-Tie Strong-Drive SDS screws which install easily and provide reduced fastener slip. Using SDS screws results in a greater net section, when compared to bolts, as no material is removed. Features Predeflected body virtually eliminates deflection due to material stretch Uses SDS screws, which install easily, reduce fastener slip and provide a greater net section area of the post compared to bolts SDS screws are supplied with the holdowns to ensure proper fasteners are used No stud bolts to countersink at openings Height: 16-5/8 in. USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.