Kreg KKS1140 Automaxx 6-Inch Bench Klamp Auto Adjust technology automatically adjusts to any thickness and clamps materials up to 4-1/2" thick Easy to regulate clamping force uses just a simple thumbscrew and extra-large padded clamp spreads clamp pressure evenly Heavy duty, all metal construction, but with ergonomic padded grips to prevent hand fatigue Auto Adjust technology maintains consistent clamping pressure Heavy-duty all-metal construction ensures strength and durability Automaxx Bench Clamps automatically adjust to any thickness Tremendous clamping force that's easy to regulate The KKS1140 Large Bench Clamp has a 6-Inch reach and clamps materials up to 414-Inch thick