It is virtually impossible to straighten out coiled tube (fuel line, brake line, etc.) by hand. The JEGS Tubing Straightener not only makes it possible, but quick and easy. Feed the coiled tubing in one end and it comes out straight on the other end - it is just that simple. The roller bearing guides make for smooth operation. Straightens 3/16" to 1/2" O.D. light wall tubing. Designed to mount in your vise.