Spare aluminium ring for Treehog tree climbing harness. With an external diameter of 52mm and internal diameter of 28mm, these replacement rings have a strength rating of 22kN. Please Note: The TH1027 is smaller than the standard size ring which comes on the TH5000 and TH7000 arborist harness. For a replacement of the same size ring which comes as standard on these harnesses, see product code TH1028.