This extension support rod adopts optimized telescopic structure with rapid locking mechanism, enabling flexible length adjustment to match various installation heights without auxiliary tools. High-strength rod body maintains stable bearing capacity to prop drywall, cabinet components, countertop slabs and decorative boards during fitting. Anti-slip rubber pads at both ends increase friction against walls, floors and ceilings to prevent sliding and protect finished surfaces from abrasion. Lightweight balanced design reduces hand burden during long renovation work. After use, the rod can be shortened for convenient transportation and storage. It is widely used in interior renovation, ceiling assembly, furniture installation and window construction. Custom stretching range, load capacity and surface treatment can be customized for global bulk buyers.