The insulators are made by bonding ceramic components with upper and lower metal attachments using adhesive. The contact areas between the ceramic components and metal attachments are padded with elastic washers. The bonding areas of the ceramic components feature structures such as sandblasting, knurling, and grooving for mechanical strength, anti-loosening, and anti-twisting. The ceramic surfaces are uniformly coated with white glaze, and the metal attachments are painted with gray magnetic paint. The main structures of the ceramic components include hollow partition (penetrable) and solid (non-penetrable) configurations. The bonded pillar insulators are typically solid and non-penetrable. This latter structure reduces maintenance and testing work compared to the former. The ceramic components come in 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 the soon-to-be phased-out external bonded pillar insulators are multi-angled. The internal bonding structure, where the metal attachments are glued into the ceramic holes, increases the insulation distance and improves electrical performance, also reducing the space required during installation. However, due to the adverse effect on mechanical strength, insulators with higher mechanical strength requirements should use the combined bonding method (i.e., the upper attachments use internal bonding, and the lower attachments use external bonding).