The Central Tool 4 Pcs #6552 Small Hole Gauge Set is a precision measuring tool designed for accurately measuring small holes within the range of .125 to .500 inches (3mm to 13mm). Made by Central Tools, this set includes four gauges that are essential for ensuring proper size and fit when working with automotive components or other precision engineering projects. The set is durable and reliable, making it a valuable addition to any toolbox for professionals and hobbyists alike. Please ask questions as the item can't be returned.