The Snap On Williams Tools@Height Adjustable Wrench has a chrome-plated finish that allows for easy cleaning after each use. Serrated knurl is designed for quick and smooth adjustments. I-Beam designed handle provides strength and durability. Inch (SAE) scale is laser-etched on the head face for easy determination of bolt head width. - Supplied with an attachment point. Engineered, the tested and certified system maintains or enhances the functionality of tools when used at height.