Heat-treated chrome vanadium alloy steel drop forged body provides long-life durability.The surface is polished and electroplated with nickel and chromium treatment, high hardness and wear resistance, oil and water resistance, not easy to rust.Providing a sure, snug fit on almost any-shaped fasteners, a 12-point box end resists slipping off while you work, saving aggravation and your knuckles.To prevent round-off, it contacts and applies force to the flat sides of fastener heads rather than the corners.Used to fasten or remove hexagon head bolts or nuts; widely used in industries as repairing and maintaining, household, machine repair, auto repair, motorcycle, and bicycle. 180° Pivoting Head Smoothly pivoting through 180 degrees, the box end head holds any angle to slide onto fasteners, which can work in any space. 5° Swing Arc 72 teeth mechanism allows you to work in the narrow space with the ratcheting movement as small as 5 degrees. Offset Open End The open end is angled 15 degrees so the wrench can be flipped over with each rotation to engage the fastener twice as often in tight spaces.