Engagement structure for tool

An engagement structure for a tool comprising:

• a drive member which includes an accommodation orifice defined in the drive member, a hexagonal tooth portion formed around an inner wall of the accommodation orifice, and six planes;
• wherein a respective one of the six planes is arranged on a center of a respective one of six peripheral sides of the hexagonal tooth portion, and the two beveled rims extends from the two sides of the respective one plane and are connected with a first adjacent beveled rim of a first adjacent plane and a second adjacent beveled rim of a second adjacent plane, wherein a ratio of lengths of the respective one plane, the first adjacent beveled rim and the second adjacent beveled rim is 2:1:2, and an angle between the respective one plane and each of the first adjacent beveled rims and the second adjacent beveled rim is 2 degrees;
• wherein the drive portion is rotated to drive a workpiece without any notches/unfilled corner or a workpiece having notches/unfilled corner;
• wherein when rotating the drive portion in a clockwise direction or a counterclockwise direction, each of the two beveled rims of the respective one plane matingly engages and does not damage the workpiece.