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The combining of extension rods provides a wide measuring range. Supplied with a standard caliper gauge for zero setting. Carbide measuring faces.Diameter of extension rods: φ15.5mm. Rod Diameter: 0.61". Accuracy: Metric(3+n+L/50)μm, (n=number of rod, L=maximumMeasuring length (mm) [Inch]. Resolution: 0.001". Each interchangeable rod is marked with its measuring range. Use to measure 3 flute cutting heads such as end mills, taps and reamers.Carbide V surface. Nice fitted case. Range: 2-40"Extension Rods: 0.5",1",2"(2pcs),4",6",8"12"