Rail length expands from 14 inches to 26 inches Suitable for rimmed or rimless sinks Best for front-to-back installation of rimmed sinks in standard cabinets and small bathroom vanities Multiple adjustment points ensure even support Quick and easy installation provides secure support from underneath the sink or sink rim Native Trails' sink undermount kit is a simple and secure method for undermounting any sink with or without a rim into a smaller (27" or less) cabinet or vanity. It is highly recommended for NativeStone rimless concrete sinks due to its easy leveling with multiple adjustment points.