Item Type: Deep Groove Ball Bearing Material: Bearing Steel ModelID x OD x Thickness(Approx.) 620420 x 47 x 14mm / 0.79 x 1.85 x 0.55in 620525 x 52 x 15mm / 0.98 x 2.05 x 0.59in 620630 x 62 x 16mm / 1.18 x 2.44 x 0.63in 620735 x 72 x 17mm / 1.38 x 2.83 x 0.67in 620840 x 80 x 18mm / 1.57 x 3.15 x 0.71in 1Great Bearing: Deep groove ball bearings are mainly used to bear radial loads, but also can bear a certain axial load. 2Reliable Work: Works stably with a rational speed under loads, enables wide use in gear box, motor, engine and so on. 33Pcs in Total: There are 3pcs ball bearing in total, which adds more convenience to the replacement and maintenance. 4Good Material: When working under heavy loads, the premium bearing steel material is very sturdy against deformation. 5Easy to Install: Designed to have a light weight and a compact size, the easy installation can be quickly completed.Please match the appropriate size before use.3 x Deep Groove Ball Bearing