Features: 48 pieces, 16 different sizes for all 60 inch threads Measures 3 to 48 threads per inch and all metric threads, pitches from 0.5mm to 6mm. The 3-wire is the best way to measure external threads The wires are packed in a plastic box with printed dimensions. Laminated charts are compiled according to US standards. Proper sizes available 8-wire measurement Thread charts for all US 60 threads Choose the wire size for threads per inch (US) or pitch (metric) Metric measurement Pitch modulus (E) equals wire measurement (M) minus decimal in "CONST" column Note: Basic P.D. equals basic major diameter plus decimal in "ADD" column minus decimal in "CONST" column Specifications: Part Name: 48 pieces thread measuring wire Material: Stainless steel Size: As pictured Color: Silver Package Contents: 48*Test Wires Note : The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. _x000D_ _x000D_