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. Tool Length in. 16, Jaw Capacity in. 1 1/2, Handle Type Black oxide, Metric Compatibility mm 38.1, Joint Thickness in. 1/2, Pieces qty. 1, Material Type Chrome vanadium steel, 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.