Add striking detail to your railing with the COS-KNL799-1-HMB Diamond Knuckle. Designed for 1/2″ square iron spindles, this matte black iron accent features a geometric diamond shape that adds bold character without overpowering your space. It’s the perfect way to elevate stair and balcony railings, blending durability with decorative flair. Easy to install, it suits both modern and traditional interiors.