The insulators are made by bonding porcelain components with upper and lower metal fittings using adhesive. The porcelain component end faces are in contact with metal fittings, which are cushioned with elastic washers. The bonding areas of the porcelain components feature structures such as sandblasting, knurling, and grooving for mechanical strength, anti-loosening, and anti-torsion. The porcelain surfaces are uniformly glazed white, and the metal fittings are coated with gray magnetic paint. The main structure of the porcelain components has two types: a hollow partition (penetrable) structure and a solid (non-penetrable) structure. The combined bonded pillar insulators are generally of the solid non-penetrable structure. This structure reduces maintenance and testing work compared to the previous one. The porcelain components have 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 outer bonded pillar insulators that are being phased out are multi-angled. The internal bonding structure, where the metal fittings are glued into the porcelain holes, increases the insulation distance and improves electrical performance, while also reducing the space required for installation. However, due to the negative impact of internal bonding on mechanical strength, insulators with higher mechanical strength requirements should use combined bonding (i.e., the upper fittings are internally bonded, and the lower fittings are externally bonded).