1. Standard 1 3/4inch Drain Opening: Fits sink hole diameter 1.6-inch to 1.9-inch. MAX. sink thickness 1.97-inch. perfect for any above-counter vessel sink with overflow.2. Solid Metal Construction: The pop-up drain stopper is constructed of brass and type 304 premium grade stainless steel, protecting against corrosion and rust in a humid environment.3. Easy to Operate: Spring loaded push button does not require a lift rod. Simply push the drain cap down to close and to seal, push again to open and to drain water. You can turn the upper cap counter-clockwise to unscrew and remove.4. Easy to Install, No Leaks: All required gaskets, seals and brass mounting nut are included. Please make sure the gaskets are in the right position (please refer to product pictures or instructions) to avoid leakage.5. Dimension: Overall length from the top of pop-up cap to the end of tailpiece: 8.46inch. Diameter at Top: 2.6inch. Diameter at threaded pipe: 1.6inch. Diameter at tailpiece connection: 1.25inch.Specifications:Pop-Up Stopper Material: Brass and Stainless SteelHole Fitting: 1.61inch ~ 1.97inchFinish: Brushed NickelOverflow: with overflowsize:205x31.5mm, Installation aperture: 41mm-55mmMaterial:Brass+Stainless Steelcolour:SilverPackage Contents:1 x Drain StopperOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.