Sink Drain for Basin without Overflow; Easy to install, with a standard installation dimension of 1 ¼", this sink drain fits all commercial sinks Automatic drain and operated with a simple finger press, the sink plug cover can be detached by hand in just a few seconds unscrew, clean, screw and done Brass construction which is then chrome plated, anti-erosion, anti-abrasion Sealing Ring: Very high density and continuous Attention: The sink hole must be round and regular, the edge must be smooth and flat. If the sink hole is crooked and frosted, it will be leaking after you install this sink drain