The Ironton 16in. Adjustable Spud Wrench is great for iron work. Features chrome vanadium steel construction with black oxide finish to resist corrosion. Tapered end of wrench helps with aligning holes. Jaw Capacity in. 1 1/2, Joint Thickness in. 1/2, Material Type Chrome vanadium steel, Metric Compatibility mm 38.1, Pieces qty. 1, Handle Type Black oxide, Tool Length in. 16, SAE Compatibility in. 1 1/2. Chrome vanadium steel Black oxide finish resists corrosion Tapered end helps with aligning holes Adjustable wrench opens up to 1 1/2in.