Jiangyin Yangfan Ship Trading Co.,Ltd is one of the best cooper ring kits manufacturers and suppliers in China, you can get cooper ring kits free sample and buy discount products from our factory.Specially designed for marine use. Contains 30 sizes/568 pieces packed in a transparent sturdy-hinged acrylic case. Details of the sizes are as follows :I.D.×O.D. ×THmm5×9×16×10×16×12×18×12×18×14×18×14×1.59×14×110×14×110×14×1.510×16×112×16×112×16×1.512×18×1.513×18×114×18×1.514×20×1.514×20×216×20×1.516×22×1.518×22×1.518×24×1.520×24.5×1.520×24.5×0.819×26×222×27×1.522×29×1.524×29×1.524×32×226×34×228×36×2813080Copper ring kit,30 Sizes/568 pcs with acryl caseSet