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Accurate size and high precision Wear resistance The surface is flat and smooth and the polished polish is bubbly. Bearing steel beads are high, high hardness, smooth surface, good roundness, wear resistance, The stainless steel bearing balls are stronger than ordinary carbon steel balls, have a high hardness and a long service life. › See more product details; Product description Quantity: 1 kg. Material: bearing steel. Whether standard parts: standard parts. Model: 9/10/11/12/13/14/15/16/17/18/19 / 20 mm; Product description Quantity: 1 kg. Material: bearing steel. Whether standard parts: standard parts. Model: 9/10/11/12/13/14/15/16/17/18/19 / 20 mm; Quantity: 1 kg. Material: bearing steel. Whether standard parts: standard parts. Model: 9/10/11/12/13/14/15/16/17/18/19 / 20 mm