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These are two budget dial-bore gauges we’ve been using for the last 10 years. The black plastic case contains a Mitutoyo 511-106, 2- to 6-inch range dial-bore gauge with 0.0001-inch increments. The wooden case contains a budget, 0.0001-inch Peacock dial gauge with a no-name 2- to 6-inch range adapter. The extensions configure each of these tools to measure between 2- and 4-inch diameters, such as on main bearing housings, the big ends of rods, or cylinder bores.