Your kitchen drain waste from. Copper sterilization effect, you can drain your numeri and odor causing microbes. Drain hole is 1 mm and with fine punching process, even fine dust catches. Also available is nothing wrong to improve water drainage effect. Set of 2 Adjustable Rings with a wide range of types of drains to install. * This is the high (12.8 cm) is available. Lip to drain trap to a depth of less than 12.8 cm the drain type, Shallow Type, if needed. (Not included)