New to the store, solid aluminum 0.75" extension rods. They are polished to a high sheen, and come in 4" and 8" varieties. These extension rods are made to order, and can have double male ends, double female, or one of each (most commonly.) Each end can be threaded differently, so they will work as adapters between machines and adapters from different manufacturers. Extension length is not dependent on the length of threads, and is measured by the length that it will seperate two pieces. Thread length is independent, and can be made to any length requested. Please give details in the order notes.