Patent 6898999 was granted and assigned to LG on May, 2005 by the United States Patent and Trademark Office.
A sleeve with a non-round engaging portion comprises a sleeve body having a receiving portion at one end thereof and a connecting portion at another end thereof; the connecting portion being communicated to the receiving portion; the connecting portion having four sides; each two opposite sides are symmetrical. The connecting portion has different sections which are different diameters for matching sizes of different spanners.