SINK DRAIN WITH OVERFLOW HOLE: Diameter of the drain stopper: 1 5/8inch (40mm). Fits Sink Drain Opening: 1 3/5inch(min) drain holes. TYPES OF MATERIALS: -up drain stopper, drain flange, threaded pipe are made from brass, tailpiece is made from stainless steel. All metal construction for maximum durability. Industy-leading is corrosion & rustproof. 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. 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. Polished chrome .Engineered for a of use.Easy to install; hardware & gaskets included. Body Material: Brass -Up Stopper Material: Brass Tailpiece Material: Stainless Steel Make sure position and shape of washers are as shown in image, Or you can follow the instructions.Incorrect washer position will cause leakage. PS: This drain is suitable for both undermount sink and sink.(non-overflow) colour:Silver Material:copper size:215*62*32mm Package Contents: 1 * Drain Stopper 3 * washers Only 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.