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