Bending a tube without kinks is an almost impossible task without a set of bending springs. The K&S Tubing Bending Kit offers neat, kinkless bends in brass, copper and aluminium tubing with outside diameters of 1/6", 3/32", 1/8", 5/32" and 3/16"(1.5mm ~ 4.5mm approx). Perfect for forming bends in brass fuel tank fill and vent tubes and a host of other tasks.