Patent ID: 8640575

Claim:
A ball end hex wrench comprising: a body having an operating end, a ball end, and a longitudinal axis extending between the operating end and the ball end, with the ball end capable of being used to drive an object when the body is rotated about the longitudinal axis, with the ball end including: an engaging section abutting against the object when the ball end hex wrench drives the object, with the engaging section including a plurality of peripheral surfaces, with the plurality of peripheral surfaces disposed circumferentially around the longitudinal axis, with each of the plurality of peripheral surfaces extending in an arcuate shape in a direction parallel to the longitudinal axis; at least one first pattern integrally defined on one of the plurality of peripheral surfaces from a same material as the body, with the at least one first pattern having a first height relative to the one of the plurality of peripheral surfaces; and at least one second pattern defined on the one of the plurality of peripheral surfaces from the same material as the body, with the at least one second pattern having a second height; with the second height different from the first height, wherein the one of the plurality of arcuate peripheral surfaces includes the at least one first pattern parallel to the arcuate shape in the direction parallel to the longitudinal axis, with the at least one first pattern partially contacting with the object when the ball end hex wrench is driving the object and is disposed at one of various working-angle positions; and a neck including a first distal end connected with the ball end and a second distal end connected with the operating end respectively and extending arcuately from the first distal end to the second distal end.