Simpson Strong-Tie HDU4 Holdown with SDS Screws They may be installed either

They may be installed either flush or raised off the mudsill without a reduction in load value

reduce fastener slip and provide a greater net section when compared to bolts

faster installation

Kit Contains: 20-HM9

The HDB holdowns are self jigging

Simpson Strong-Tie HDU4 Holdown with SDS Screws They may be installed eitherThe Simpson Strong Tie HDU4 SDS2. 5 holdown is pre deflected during the manufacturing process, virtually eliminating deflection under load due to material stretch. They use Simpson Strong Tie Strong Drive SDS screws (included) which install easily, reduce fastener slip and provide a greater net section when compared to bolts. Anchor with a 5 8 anchor. Made of 14 gauge galvanized steel.