The Irwin 2 inch X 3-1/2 inch Deep Throat 100 Series has many improvements over the competitions. The handle is bigger which makes it 25 percent easier to apply torque. This feature will reduce hand fatigue and make it easier to apply force. The double threaded screw allows you to create 50 percent more pressure than the nearest competitor. This will reduce hand fatigue and make it easier to apply force. The double threaded screw will give you 50 percent less screw deflection which will save you time by reducing drift.