| 摘要 |
<p>Screwdriver hexagonal insert comprises an outer sleeve (10) and an inner sleeve (20). Preferred Features: Recesses (12) are formed on the inner surface of the outer sleeve and flanges (24) are formed on the outer surface of the inner sleeve corresponding to the recesses. The flanges are curved, square or triangular. The outer sleeve is made from steel. The inner sleeve is made from aluminum.</p> |
