uxcell 8pcs SG20 U Groove Track Guide Bearing 6x24x11mm U SG20, silver
SG20 Bearing: I.D.=6mm, O.D.=24mm, Thickness=11mm, Groove width=6.5mm, Groove depth=1.75mm. Suffix on the bearing just for differentiating between Sealed and Shield type of bearing. Protect from dirt and debris.Sealed (Designation Suffix RS/2RS) – Made of sheet steel reinforced nitrile butadiene rubber (oil- and liquid-resistant).