XVL Bathroom Faucet Vessel Vanity Sink Pop Up Drain Stopper with Overflow, Golden D37C This is big size drain for basin.Please check the second and the sixth image and make sure this product is the right size and fit for your basin or sink Diameter of the mounting hole should be from 1.6 inch to 2 inch(The third image is the installation instruction) Thickness of the mounting hole should less than 1.8 inch(The third image is the installation instruction) Please check the size of the sink hole and make sure the Porcelain Sink with an overflow hole The third image is the illustration for installation.Easy to install.make sure the Porcelain Sink with an overflow hole