1.13 year experience, 2.Certificate ISO9001.2008, 3.Material: Bearing steel, 4.Various size and type, 5.15-30days delivery. Insert ball bearing:(1)Type range: UC201~215, UK205~218, SA201~211, SB201~208, SER201~214, HC201~215, CSA201~211, CSB201~208,(2)Size range: Shaft dia: 12~80 mm Metric and Inch size available,(3)Material: chrome steel, stainless steel, Thermoplastic, Zinc Alloy, pressed steel ...