The 6808ZZ Bearing with dimensions 40×52×7 mm is a thin-wall metal bearing:

• Type: Deep Groove Ball Bearing (6808ZZ)
• Dimensions:
  • Inner Diameter (ID): 40 mm
  • Outer Diameter (OD): 52 mm
  • Thickness/Width: 7 mm
• Shield Type: Double metal shield (ZZ) for dust and debris protection