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This 3mm high Harmer Uni-Shim is a height-extending stackable product. With a diameter of 110mm, it is the perfect option for use alongside the Harmer Uni-Ring. A maximum of only two Uni-Shims are required per one Uni-Ring.Features & Benefits: Harmer Uni-Shim 3mm Uni-Ring Height Extender, 3mm height adjustment, Diameter of 110mm, Perfect for use alongside the Harmer Uni-Ring, Maximum of two Uni-Shims per Uni-Ring. Harmer Uni-Shim 3mm Uni-Ring Height Extender Polypropylene