MITUTOYO Borematic interchangeable-head bore gauge set 6-12 mm Designation: 568-931 / SBM - 12ST = previous designation which corresponds to present Mitutoyo designation: 568-924 Range: metric, 6-12 mm Resolution: 0.001 mm Digimatic, snap-open Display: LCD Measuring method: three-point Battery: 2, type SR44 Content of the set: display unit, measuring head assembly: 6-8, 8-10, 10-12 mm, 2 setting rings 8 and 10 mm, spanners, wooden case; Extension ro