Simplify your next long-range measurement project with Johnson's Structo-Cast® measuring wheel. It features a three-piece telescoping aluminum handle, with an ergonomic non-slip rubber grip handle that extends from 17" to 42". With a rigid aluminum frame and durable 4-inch rubber wheel, this measuring wheel was built to last. It also features a five-digit, easy-read magnified counter that provides accurate measurements in feet and inches.Johnson's measuring wheels are useful for Adjusters, estimators, surveyors, civil engineers, landscape architects, paving crews, and more whenever long-range measurements are required. The 4-inch diameter wheel on this model makes it ideal for fairly smooth surfaces and makes measuring a snap for road construction, parking lot and driveway installations and resurfacing and concrete pours. Interior applications include measuring gyms, commercial hallways and residential areas. For rougher surfaces, consider Johnson's model 1877-0200 measuring wheel, which has a 12.5-inch diameter.