This above sink dish rack is extendable from 21""to 39""/53 to 99 cm to comply to most of the household single or double sinks. It is recommended to use with faucet height under 16.5""/41.5 cm and with minimal gaps between countertop and cabinet 21""/53 cm. In that case, this over sink rack will not touch head, block the view or impede hands.