Orion Hardened & Ground Parallel Set - 14 Pairs - 150mmThe ORION 150mm 14pc Ground Parallel Rest Set is hardened & Polished. It has a matching pair tolerance of 0. 01mm. Set includes 2 pairs of each: 14 mm, 16 mm, 18 mm, 20 mm, 22 mm, 24 mm, 26 mm, 28 mm, 30 mm, 32 mm, 35 mm, 40 mm, 45 mm, 50 mm high parallels Hardened & polished Matching pair tolerance 0. 01mm Set includes 2pcs of each: 14 mm, 16 mm, 18 mm, 20 mm, 22 mm, 24 mm, 26 mm, 28 mm, 30 mm, 32 mm, 35 mm, 40 mm, 45 mm, 50 mm high parallels