Special hooks of types US and USK are designed to connect the rod of a suspension insulator or shackle to other line fittings. They feature a bent pin that provides a chain-type hinge connection with clamps of type SK, suspension supports, and yokes of type 2KU. USK-type hooks are shorter than US-type hooks and are not intended for attaching protective fittings. Manufactured according to TU 3449-001-52819896-2010.