The ROHL QN25UM is a 25-inch undermounting kit. This particular undermount system allows easy installation and is a perfect fit for Allia fireclay kitchen and bar sink collections, specifically for model numbers 6307, 5927, 6347, 6337, 6339, and 6737. It is best to install this system with granite or solid surface countertop materials. Wood supports will not be needed. For convenience, these can be cut down to the length that will fit the cabinet size. Leveling bolts are included. For the 6737 Allia Fireclay Round Single Bowl Bar/Food Prep Sink, 2 units of this undermounting kit must be ordered for proper installation. This QN25UM undermounting kit is not designed for the UM3018 Shaws Classic Fireclay Kitchen Sink. This product has a 1-year warranty on manufacturer defects. ROHL products offer exceptional quality and integrate the finest components in kitchen and bath collections. Whether traditional or modern style, ROHL creates beautifully crafted faucets, sinks and accessories.