The insulators are composed of porcelain components and upper and lower metal attachments bonded with adhesive. The porcelain surface in contact with the metal attachments is padded with elastic washers. The bonding sections of the porcelain components feature structures such as sandblasting, knurling, and grooving for mechanical strength, anti-loosening, and anti-twisting. The porcelain surfaces are glazed uniformly with white enamel, and the metal attachments are coated with gray magnetic paint. The main structure of the porcelain components in the insulators consists of two types: a hollow partition (breachable) structure and a solid (non-breachable) structure. The combined bonded pillar insulators are generally of the solid non-breachable type, which reduces maintenance and testing work compared to the former structure. The porcelain components have two shapes: with or without棱. The multi-ridge shape increases the surface distance and has better electrical properties than the single-ridge shape. All products except for the external bonding pillar insulators to be phased out are of the multi-ridge shape. The internal bonding structure, with the metal attachments bonded into the porcelain holes, increases the insulation distance and improves electrical performance, while also reducing the space occupied during installation. However, due to the negative impact on mechanical strength, insulators with higher mechanical strength requirements should use the combined bonding method (i.e., the upper attachments are internally bonded, and the lower attachments are externally bonded).