Penknife style screw pitch gauges. Milled blades, Typ gwintu = Jednostki brytyjskie, Liczba łopatek = 30, Rozmiary w zestawie = 4, 4-1/2, 5, 5-1/2, 6, 7, 8, 9, 10, 11, 11-1/2, 12, 13, 14, 15, 16, 18, 20, 22, 24, 26, 27, 28, 30, 32, 34, 36, 38, 40, 42, Naj