The Stainless 303 Grade Holder is specifically designed to accommodate cable outside threaded terminals in a cable railing system. It is compatible with a 42.4mm newel post and provides a secure attachment point for the terminals. Please note that a 5mm screw is required to attach the holder to the side of the newel post, and this screw needs to be purchased separately. The holder is made from high-quality stainless steel, ensuring durability and resistance to corrosion. It is an essential component for a sturdy and reliable cable railing installation.