SOLID CONSTRUCTION: A great, defined, rail construction makes sure the clamps do not slip and tighten very effectively when really putting the pressure on. (rated up to 170lbs) QUICK-CLAMP: The quick-release latch makes it so easy to take them off your project or adjusts the fix in seconds. Larger pads provide a larger area of thrust surface. More balanced force and parallel clamp. BETTER USE EXPERIENCE: Non-marring removable and replaceable pads feature flexible material and non-slip texture, which enhances the overall clamping force. The ergonomically-designed handle and dipping plastic on the quick-release latch are both for customers' comfort. CLAMP & SPREADER: The unique quick-change button design allows the f clamp to be a spreader as well. Just press the red button to take the jaw off and then reverse it before putting it back in, you will get the spreader you need. BAR CLAMPS SET: The set contains 4 pieces of 6" bar clamps. The 6" clamp can be set to a spreader with sizes up to 12". A great, defined, rail construction makes sure the clamps do not slip and tighten very effectively when really putting the pressure on.