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. Smoothly pivoting through 180 degrees, the box end head holds any angle to slide onto fasteners. The 12-Point box end provides strong gripping to tighten or loosen bolts without round-off, it won't slip even under high torque. To prevent round-off, it contacts and applies force to the flat sides of fastener heads rather than the corners. 72 teeth mechanism allows you to work in the narrow space with the ratcheting movement as small as 5 degrees. 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. Used to fasten or remove hexagon head bolts or nuts; widely used in industries as repairing and maintaining, machinery, electric power, household, industrial and mining. Specification: Hardness: HRC 43-48 Material: Chrome Vanadium Steel (CR-V) Finish: Chrome Plated, Polishing Color: Silver Tone Double End Size: 6mm Total Length: 120mm / 4.72inch Double End Size: 7mm Total Length: 135mm / 5.31 inch Double End Size: 8mm Total Length: 140mm / 5.51 inch Double End Size: 9mm Total Length: 148mm / 5.83 inch Double End Size: 10mm Total Length: 160mm / 6.3 inch Double End Size: 11mm Total Length: 163mm / 6.42 inch Double End Size: 12mm Total Length: 168mm / 6.61 inch Double End Size: 13mm Total Length: 170mm / 6.69 inch Double End Size: 14mm Total Length: 189mm / 7.44 inch Double End Size: 15mm Total Length: 199mm / 7.83 inch Double End Size: 16mm Total Length: 220mm / 8.66 inch Double End Size: 17mm Total Length: 226mm / 8.9 inch Double End Size: 18mm Total Length: 238mm / 9.37 inch Double End Size: 19mm Total Length: 245mm / 9.65 inch Double End Size: 20mm Total Length: 290mm / 11.42 inch Double End Size: 21mm Total Length: 290mm / 11.42 inch Double End Size: 22mm Total Length: 290mm / 11.42 inch Double End Size: 23mm Total Length: 310mm / 12.2 inch Double End Size: 24mm Total Length: 330mm / 12.99 inch Package Content: 1pc x Flex-Head Ratcheting Wrench