These clamps combine speed with power. The ratchet mechanism gives an increased mechanical advantage and makes it easy to apply full pressure. Pressing the release button instantly relieves the pressure. These are extremely versatile clamps and are unaffected by vibration. Useful for many jobs, such as with jigs or temporarily holding parts whilst drilling. A removable plastic stop on the end of the clamp allows the arm to be removed, turned around, and repositioned. This means the clamp can also be used as a spreader. 120 mm x 60 mm – 160kg max clamping pressure 160 mm x 80 mm – 300kg max clamping pressure 200 mm x 100 mm – 350kg max clamping pressure Lifetime guarantee.