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A hard steel insert is locked into the body of the rubber weight plate via reinforcement keys.
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These plates are much thinner than other bulky economy bumpers this is achieved by introducing a concealed steel core to the rubber plate allowing more weight to be loaded on the bar.
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International IWF colour coded
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Strict weight tolerance
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450mm diameter (IWF standard)
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Plate thicknesses are:
5kg - 25mm
10kg - 40mm
20kg - 65mm