5kg dumbbell plates, 28mm hole diameter, set of 2. These are unused, new items mistakenly purchased as weights for research. They will be shipped in the original cardboard packaging from the manufacturer. - Brand: GronG - Weight: 5kg - Hole Diameter: 28mm - Quantity: Set of 2 As shown in the photos, the images showing the hole diameter are not of the actual product but are used as a sample to display the diameter. Thank you for looking.