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Product Description: *Super precision deep measuring bore gauge,suitable for comparative method to measure the inner diameter of the workpiece. *Measures bore to 150mm (5.9") deep, Range 50MM(1.97") to 160MM(6.23") diameter,0.01MM(0.0003") precision graduations. *The dial gauge diameter indicator is equipped with an excellent guiding bridge, which is self-centering and reliable. *Interchangeable contact points for measuring a wide range of diameters. Product Features Measuring diameter range:50mm(1.97")-160mm(6.23") Measures deep:150mm (5.9") Accuracy:0.01MM(0.0003")