内六角扳手在机床设备维修中，是使用频率较高的工具之一。传统的内六角扳手，是按照内六角尺寸一对一的用六方钢弯成90°再截成不等长的形状。这种扳手在使用当中，存在下述弊病：其一是缺乏经验的人，很难一次对照内六角孔找准尺寸一致的内六角扳手，而不得不把一组十几把的 Hex wrench in the maintenance of machine tools, the use of higher frequency of the tool. The traditional Allen wrench, according to the hexagon size one-on-one with a hexagonal steel bent into 90 ° and then cut into unequal length shape. This type of wrench in use, there are the following shortcomings: First, inexperienced people, it is difficult to control a hexagonal hole size aligned hexagonal wrench, and had to put a group of dozen