HyperTough 8-Piece Hobby Clamp Set Easy to use: squeeze handle to apply clamp or spreader pressure; press button to release pressure Spring clamp set/bar clamps feature red tips for greater precision Quickly converts bar clamp to spreader:Remove butterfly screw / Tighten butterfly screw Place small jaw on opposite end of bar / Two 1" spring clamps Four 3/4" mini spring clamps / Slide off small jaw / Two 4" mini bar clamps