Standard Pack = 1 piece(s). For Threads = 48 Wires (16 Sizes). Accuracy within +0/.0004 for Sizes .018 inch-108 inch. Accuracy within +0/.0005 for Sizes .120 inch-.185 inch. Measures all US 60 deg threads from 3-48 threads per inch. Laminated conversion chart included; Type = Thread Measuring Wire Set;