AGS Brake Line Fitting Gauge for SAE/Inch threads is an accurate and easy-to-use thread checker for the most common thread sizes found in automotive braking systems and includes special sizes not found in typical hardware store thread gauges. Includes sizes: 1/8 in. NPTF, 1/4 in. NPTF, 3/8 in. X 24, 7/16 in. X 20, 7/16 in. X 24, 1/2 in. X 20, 9/16 in. X 18, 9/16 in. X 20, and 5/8 in. X 16. Conveniently assembled onto a wire loop, it is especially well suited for distinguishing between similar inch and metric threads. This tool is a great addition for Auto, Motorcycle, Marine, ATV or RV Repair Shops. Features – Each size has a male and female end checker on the same gauge. – Thread sizes are permanently and clearly stamped onto each gauge. Inch gauges are clear zinc plated. A wire cable with plastic coated loop at each end provides convenient hanging in any location. – Each gauge rotates freely on the wire cable for quick and easy thread verification. AGS also offers the Brake Line Fitting Gauge in ISO/Metric version.