5/8" BoxBolt® Expansion Anchor for Steel Applications, 3" Screw Length, 1-1/16" Hole Diameter, Size 1, Zinc Plated

Zinc plated for the less aggressive environments

The Original BoxBolt is a fully tested and approved blind structural bolt solution for connecting to hollow section steel, or structural connections which access is restricted to only one side. The BoxBolt is suitable for rectangular, square, and circular hollow sections. The structural steel anchor bolt features a hexagon head designed to be installed with a standard wrench.