The insulators are made by bonding a porcelain component with upper and lower metal attachments using adhesive. The porcelain component's end face contacting the metal attachments is padded with an elastic gasket, and the bonding sections of the porcelain feature structures like sanding, knurling, and grooving for mechanical strength, anti-loosening, and anti-torsion. The porcelain surface is evenly glazed white, and the metal attachments are coated with gray magnetic paint. The main structure of the porcelain component of the insulator comes in two types: a hollow partition (penetrable) structure and a solid (non-penetrable) structure. The bonded pillar insulators are generally of the solid non-penetrable type, which reduces maintenance and testing work compared to the previous type. The porcelain component of the insulator has two shapes: multi-angled and less-angled. The multi-angled shape increases the surface distance and has better electrical properties than the less-angled shape. All products except for the external bonding pillar insulators that are being phased out are multi-angled. The internal bonding structure, where the metal attachments are glued into the porcelain holes, increases the insulation distance, enhancing electrical performance and reducing the space required for installation. However, as internal bonding is not beneficial for mechanical strength, insulators with higher mechanical strength requirements should use a combined bonding method (i.e., the upper attachments are internally bonded, and the lower attachments are externally bonded).