Keson MP401 Metal Frame Measuring Wheel with Spoked Wheel (Graduations: ft.), 15-1/2-Inch Diameter N/A Imported Innovative design for simple, center-line functionality and great balance Huge numbers make for easy reading Durable 3/8 inch rubber on the wheel preserves the integrity of the wheel's shape over time. Rugged 3/4 inch steel frame, tough enough to handle any terrain Barrel clamp locks the handle upright, releases in a second for storage