We're trying to identify the middle part in this picture. We would appreciate any help we can get.

part image

1 Answer 1


It looks like a Round 2 x 2 Dome Top (553b) brick with a Round 1 x 1 (4073) transparent plate.

  • 1
    To be specific, it is likely 553b (open stud with axle holder).
    – Phil B.
    Commented Feb 19, 2017 at 0:09
  • I'm not to sure, It looks like it could be 553(a) or 553(b) but not 553(c), They stopped using 553(a) in 2009 so it might not be that depending on how old these pieces are.
    – Ambo100
    Commented Feb 19, 2017 at 14:09
  • 1
    I can clearly make out an 'x' shaped axle hole (not a '+' shaped one). Leads me to believe it is 553b.
    – Phil B.
    Commented Feb 20, 2017 at 1:40

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