The Moore & Wright 966 Series Traditional External Micrometer has a blue textured frame finish with tungsten carbide measuring faces. The 'speeder' type ratchet, locking lever and adjusting key make this micrometer easy to use. It has a 6.5mm spindle diameter. The micrometers are manufactured to BS870, DIN 863/1, ISO 361 standards. Supplied in a case.The 1966M/50 Traditional External Micrometer has the following specification: Micrometer Range: 25-50mm.Measuring Faces: Flatness: 0.001mm, Parallelism: 0.003mm, Accuracy: 0.003mm.Resolution: 0.01mm.Additional Information:Micrometer Type: ExternalMetric/Imperial: MetricMin. Measurement (mm): 25Max. Measurement (mm): 50Graduation (mm): 0.01