Universal Bathroom Sink Plug Pop-Up Stopper Wash Basin Core Bounce Drain FilterFeature: 1. Perfect compatibility: We are compatible with most sinks. Two sizes of rubber rings ensure a tight fit with drains of all sizes. Internal diameters range from 1. 1 "to 1. 45" and are widely used in washbasins, bathroom sink drains, and shower tub drains. 2. There are two designs of pop up brass core and plastic core: pop up bathroom sink plug uses a pop up mechanism, which can easily open and close the drain pipe. These two types of cores