A socket has a socket section and an assembling section connected to the socket section. The socket section is cylindrical and has an axial direction, a peripheral surface, a first end, a second end, a socket hole, and a grasp portion. The first end and the second end of the socket section are opposite each other in the axial direction of the socket section. The socket hole is axially defined in the first end of the socket section. The grasp portion is annularly concaved in the peripheral surface of the socket section and has a cross-section being along a diametrical surface of the socket section. The cross-section of the grasp portion has two opposite curved edges. The assembling section is coaxially connected to the second end of the socket section. The concave grasp portion makes the socket easily and securely grasped.
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