Get a bigger grip with our 20" Big Easy Jaw Extensions! Optional equipment for our 16" Big Easy Jaws. When mounted to our 16" Big Easy Jaws, they expand your maximum gripping diameter to 18" and the expanding diameter to 19-1/2". When jaws are fully closed, the o.d. is 18-3/4", when jaws are fully open the o.d. is 20". Your lathe must have a minimum swing of 20" to use these jaws. Easy Chuck not included.