The finished drain grate measures 3-1/2" in diameter, which sits in the height adjustment collar. The height adjustment collar itself has an integrated holder that allows you to securely fasten your finished drain grate. The holder on the height adjustment collar measures 3-3/4" in diameter, and allows you to adjust your drain height anywhere from 1/4" to 1-1/4". The height adjustment collar will allow you to match your drain and tile height exactly.
