The Wright Drive® 12-point design distributes contact stress more effectively than any other wrench system available. It spreads stress evenly over a larger contact area and away from the fastener corners. The result is up to ten times more tool-to-fastener contact area than conventional wrenches. This design improves fastener torque load while decreasing rounding and distortion of the fastener.
The patented 6-point Wright Drive is, in effect, a careful blending of Wright’s 12-point design with the heavy-duty gripping characteristics of a traditional 6-point wrench opening. It offers many of the same advantages of the 12-point design, including greater strength, more torque and reduced rounding of the fastener corners. Patent No. 5,284,073.
The main advantage of the 6-pt. design is its gripping power. The Wright Drive’s minor circle diameter, which is a measure of the ability to grip an undersized fastener, is exactly the same as a traditional 6-point opening. The smaller the diameter, the better the grip on undersized fasteners and fasteners with badly rounded corners.