Refine your staircase with the COS Double Knuckle Square Iron Spindle, finished in elegant matte black. Its geometric square design and dual knuckle feature offer a clean, contemporary profile that suits both modern and transitional spaces. Durable and rust-resistant, it’s crafted for the Canadian climate—ideal for homeowners and contractors upgrading railings with style and safety. Compatible with most wood and iron systems, this spindle enhances any stair renovation.