Refine your railing design with the COS-KNL898-HMB Spindle Knuckle. Crafted from durable iron with a sophisticated matte black finish, this square 1/2″ knuckle offers both decorative flair and structural enhancement to your stair or balcony spindle system. Perfect for DIY upgrades or professional installs, it’s compatible with most 1/2″ square iron balusters. A sleek, timeless look that suits modern and traditional interiors alike. Upgrade your railing system with confidence