Hillman Bolt, Nut & Screw Gauge is an essential tool for every toolbox or garage, designed to make measuring fasteners quick and accurate. This versatile gauge measures diameter, length, and hex size across a wide variety of bolts, nuts, and screws, ensuring you have the right part for your project. In addition to its fastener measuring capabilities, it features both a 6-inch ruler and an 80mm metric ruler, providing added convenience for your measuring needs. Model Number: 9977527