Whether you are clamping or spreading the original bessey duo klamp always lies securely in your hand thats because the handle and pump lever are parallel to the rail thus ensuring the best possible hold the innovative duo klamp makes going from clamping to spreading amazingly easy this allows you to switch the convenient one handed clamp from clamping to spreading at any time simply turn the knob and youre done so all you need to do is switch not convert the duo klamp duo clamping and spreading