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. Pieces qty. 1, Metric Compatibility mm 38.1, Jaw Capacity in. 1 1/2, SAE Compatibility in. 1 1/2, Tool Length in. 16, Handle Type Black oxide, Joint Thickness in. 1/2, Material Type Chrome vanadium steel. Chrome vanadium steel Black oxide finish resists corrosion Tapered end helps with aligning holes Adjustable wrench opens up to 1 1/2in.