Simpson 1" x 13" Strong-Bolt 2 Wedge Anchor, Zinc Plated Fully-Assembled SDWF FLOOR-TO-FLOOR Screw Why do these screws have

Why do these screws have inverted upper threads

Material Compatibility: Thick to medium metal

Height: 14 in

This blade is compatible with hardwoods

allowing users to leverage both shank types with a single rotohammer

Simpson 1" x 13" Strong-Bolt 2 Wedge Anchor, Zinc Plated Fully-Assembled SDWF FLOOR-TO-FLOOR Screw Why do these screws haveThe Simpson Strong Tie Strong Bolt 2 Wedge Anchor is a 1 in. x 13 in. zinc plated carbon steel wedge type expansion anchor engineered for high performance fastening in demanding structural applications. Designed by Simpson Strong Tie, this fully assembled anchor is an optimal choice for use in seismic and high wind conditions, and is code listed for both cracked and uncracked concrete as well as masonry applications. Its dual undercutting embossments