Kreg Bench Clamp Base System 3-1/2-in Kreg Clamps Spring ClampCreate a versatile, movable bench top clamping station Includes 3 In. (76 mm) bench clamp and bench clamp base with bolt and knob Automaxx auto adjust technology adjusts the clamp automatically to match material thickness Clamps materials up to 3 1 2 In (88 mm) thick; 3 In (76 mm) reach Easy to regulate clamping pressure with a simple thumbscrew Extra large padded clamp spreads clamping pressure evenly Ergonomic padded grips prevent hand fatigue