Missing the finishing touch? BLANCO decorative kitchen sink waste flanges perfectly compliment any of our stainless steel and SILGRANIT sinks. These drain additions fit the universal 3.5″ drain opening. BLANCO color-matched drains can be paired with our SILGRANIT sinks for a cohesive color statement, or use classic chrome or stainless steel for a contrasting look to any SILGRANIT sink. For Use with Disposals.