Made of nickel plated brass, with ratchet top, accurately machined stainless steel rod.
Micrometer Screw Gauge, Nickel Plated Brass - Range 0-25 x 0.01 mm (1) Micrometer. Range 0-25 x 0.01 mm, supplied in case. Accuracy is perfect for a hobbyist or student -- at 10 mm, accuracy is ± .003 mm.