Vance Undermount Universal Undermount Sink Installation Kit Includes Rails And Hardware For Fast And Easy Installation Of All Types Of Undermount Sinks All Metal Construction Will Not Split Or Warp Can Be Used With All Sink Types Even The Heaviest Castiron, And With Solid Surface Or Stone Countertops Save Time, Money And Materials By Eliminating The Need For Wood Supports And Shims Size Can Be Adjusted To Fit Cabinet