螺丝刀是机修工、汽车修理工,木工和电工最常用的一种工具。改进后的螺丝刀制造容易,使用轻巧。在螺丝刀头部可换装几种拧紧螺丝和螺母的套管头,以及拧紧埋头螺钉的改锥,使用时只要握紧手柄左右扭动小角度就可使螺钉和螺母拧紧(或松开),因此在仰天操作且拧紧空间又较小时,装接细长套管头或改锥就显得更为方便省力。 Screwdrivers are among the most commonly used tools for mechanics, car mechanics, carpenters and electricians. The improved screwdriver is easy to manufacture and lightweight. In the head of the screwdriver, several kinds of casing heads for tightening the screws and nuts, as well as the screwdrivers for tightening the countersunk screws, can be tightened (or released) by tightening a small angle around the handle with the handle being used Operation in the sky and the tightening space is small, the installation of slender casing head or screwdriver is more convenient and labor-saving.