National Coupler – Designed to connect 2-pieces of threaded rod. Hexagonal shape allows wrench or other tool to tighten or loosen product. Threads are UNC-2A. Made of steel. Zinc-plated. National catalog Model – Thread Size: 7/16″, Threads Per Inch: 14 tpi, Material: Steel, Finish: Zinc-Plated, Pkg Qty: 1
- Hexagonal shape allows wrench or other tool to tighten or loosen product