Grong Iron Dumbbell Barbell Plate, Shaft Diameter 1.1 Inches (28 Mm), Iron 2.8 Lbs (1.25 Kg) X 2 Piece Set (5.5 Kg)compatible with 28mm shaft diameter This iron dumbbell plate has rounded corners and reduces floor scratchesFeatures of Grong Iron Dumbbell Barbell Plate, Shaft Diameter 1.1 Inches (28 Mm), Iron 2.8 Lbs (1.25 Kg) X 2 Piece Set (5.5 Kg)..