The Original Thread Checker is an accurate and easy-to-use thread verifier for both nuts and bolts. Conveniently assembled onto a wire loop, it is especially well suited for distinguishing between similar inch and metric threads. Made in U.S.A. Specifications Each size has a nut and bolt checker on the same gauge Thread sizes are permanently stamped onto each gauge Inch gauges are clear zinc plated, metric gauges are black oxide Wire cable with loop for convenient hanging SAE 23 Piece Set Inch Sizes: 6-32 10-32 5/16-24 7/16-20 9/16-18 3/4-16 6-40 1/4-20 3/8-16 1/2-13 5/8-11 1-8 8-32 1/4-28 3/8-24 1/2-20 5/8-18 1-12 10-24 5/16-18 7/16-14 9/16-12 3/4-10 Metric 21 Piece Set Metric Sizes: M3x0.5 M7x1.0 M10x1.25 M12x1.75 M16x2.0 M24x3.0 M4x0.7 M8x1.0 M10x1.5 M14x1.5 M20x1.5 M5x0.8 M8x1.25 M12x1.25 M14x2.0 M20x2.5 M6x1.0 M10x1.0 M12x1.5 M16x1.5 M24x2.0
