Wright sockets feature the patented Wright Drive®, which provides more torque with less fastener damage. The Wright Drive design distributes contact stress more effectively than any other wrench system, with the stress spread over a larger contact area and away from the corners, Wright Drive improves fastener torque load while decreasing rounding and distortion of the fastener. The 12-point design has up to 10x more tool-to-fastener contact area. Wright Drive® 12-point – maximum 0.057 in L of flat contact at engagement under load with 5/8 in Wright Drive design and SAE-grade 5 fastener. Patented Wright Drive® distributes contact over a larger surface area for greater gripping power and strength, oiled black oxide finish. Forged and machined for best fit and unyielding strength. Precision heat-treated and tempered for optimal hardness, ductility and durability. Easy to read stamp pattern in order to quickly determine opening size. Meets or exceeds ASME B107.110. Made in the USA.