1、These bearings are single‑row ball rolling type, which can improve the running stability and operate more smoothly. 2、These bearings are made of imported materials and polished, which are rigid and can prolong their service life. 3、Rolling bearings run fast and have low noise, which can reduce damage to mechanical equipment. 4、Commonly used in automotive equipment, industrial machinery or household appliances, with a wide range of usage scenarios. 5、Contains 5 replacement S6306Z bearings, which can be replaced and installed at any time, with strong practicability. 5 x Bearing Item Type: BearingMaterial: Stainless steel 440Model: S6306ZUse Characteristic: High speedRolling Element Type: BallNumber of Rolling Element: Single rowInner Diameter: Approx. 30mm / 1.2inOuter Diameter: Approx. 72mm / 2.8inThickness: Approx. 19mm / 0.7in