6″, face lock clamp with automaxx auto adjust technology, 6″ reach 152 mm, clamps materials up to 5″ thick 127 mm, adjusts automatically to match material thickness, easy to regulate pressure with a simple thumbscrew, large clamp faces spread pressure evenly, ergonomic padded grips prevent hand fatigue, works with the kreg jig r3 clamp pad adapter, as well as the portable base, highly durable, all metal construction.