Bolt master 11172 1/8" X 12" Zinc Plated Square Key Stock. Square keys are small bars of any length but its height and width are the same. It's a piece inserted between a shaft and a hub to prevent relative rotation. Square keys are common in general industrial machinery. Zinc-Plated For Moderate Corrosion Resistance. Diamond Metal Sheet, Cold Rolled, Weldable, Cut, Expanded & Flattened Into A Diamond Shaped Pattern. Undersized tolerance key stock is slightly smaller than the listed size and provides a loose fit in a keyway. This product is manufactured in China.