The Sealey DBG507 Dial Bore Gauge supplied in a wooden storage case The Sealey DBG507 is a Dial Bore Gauge that will indicate the deviation from set size by up to 5mm with an accuracy of 0.01mm. The DBG507 features a precision mechanism with a ∅50mm dial and locking rotating bezel, offering an accurate method of measuring a bore or detecting a taper or ovality. Features: Supplied in wooden storage case Probe body, dial indicator, anvil and spacer rings are also included Will indicate the deviation from set size by up to 5mm with an accuracy of 0.01mm Precision mechanism with ∅50mm dial and locking rotating bezel, offering an accurate method of measuring a bore or detecting a taper or ovality Specification:  Model No: DBG507  Resolution: 0.01mm  Dial Diameter: ∅50mm  Measuring Range: 10-18mm  Maximum Deviation Measurement, Gauge: 5mm  Maximum Deviation Measurement with Stem: 1mm