... ISO9001 certificate, size for 20.8-38,18.4-38,15.5-38,11 ... Section widthOverall diameter20.8-38W18L12385281835400020018.4-38W16L1037467175531518018.4-30W16L10364671550281518018.4-34W16L10364671655299018015.5-38W13L10343911549176020711.2- ... 28W138343781365188018013.6-28W128313451310164520013.6-24W1210303451210179025012.4-28W118293151260151023012.4-24W118293151160141523011.2-28W1010282851205149031011.2- ...