Standard 1-3/4 inch drain opening. Drain hole diameter range: 1.57 in to 1.90 in. Maximum sink thickness: 1.97 in. Suitable for sinks without overflow. Durable construction with mounting nut included for reliable installation. Key dimensions - Top diameter: 1.50 in - Flange diameter: 2.40 in - Threaded pipe diameter: 1.60 in - Tailpiece connection diameter: 1.25 in Compatibility and performance - Designed for standard 1-3/4 in drains - Good fit for sinks with 1.57–1.90 in hole size and up to 1.97 in thickness - Includes necessary mounting hardware for a secure seal Use scenarios - Replacing a worn drain on a bathroom sink with a standard 1-3/4 in opening - Installing in a vessel sink that does not have an overflow feature - Upgrading a vanity sink drain where the tailpiece is 1-1/4 in in diameter This product provides a precise, reliable drain solution with clear compatibility and straightforward installation.