The SUPRA-S Quick-action Drill Chucks are self-tightening, flat jaw drill chucks designed for use with stationary and hand-operated drills. They feature a strong retaining ring, are manufactured from steel, and are hardened and superfinished. These chucks are only suitable for clockwise rotation. They offer a concentricity of up to 0.17 mm and an increase in clamping force proportional to the cutting force, thanks to the re-tightening function. This design allows for easy and quick clamping of tools.