Strong and Long Service Life Heat-treated chrome vanadium alloy steel drop forged provides long life durability.Polish chrome finish for corrosion resistance.Two different sizes, allow you to easily tighten or loosen more bolts just by flipping the wrench over.Off-corner loading design of the box end provides better grip and reduces the rounded corners of the fastenersThe ratchet mechanism at the end of the box end allows you to turn the fasteners without removing and repositioning the wrench.Widely used in industries as repairing and maintaining, machinery, electric power and household. Product Detail 5° Swing Arc 72 teeth mechanism allows you to work in the narrow space with the ratcheting movement as small as 5 degrees. Classic 12 PT The 12-Point box end provides strong gripping to tighten or loosen bolts without round-off, it won't slip even under high torque. Clear Size Marking Two sizes are clearly stamped on each end, you can quickly identify and find the right size