Star Iron Works, a division of Drilltube International, manufactures and distributes an array of drill rod, stabilizers, subs, rotary drilling bits, tools, parts and accessories for any type of water well drilling application. The company's tri-wing drag bits feature subs made of 4140H alloy steel, shanks made of grade "D" tubing, a carbide step design, and wings of 3¿inch high strength steel. Also, the subs are reusable - the same sub works on many sized bits. Star Iron Works, Card No. 278