One hand holds the drill and the other hand holds the joint rod jacket more convenient to position the batch head ▶ Flexible retraction. Telescoping back and forth to reduce shaking, more accurate positioning, and more agile use ▶ Main uses. Installing screws to the batch head for navigation and controlling the wobble when the longer batch head rotates ▶ Improve work efficiency. Strong internal magnetism, firmly adsorbs the drill head, improving work efficiency and saving work time ▶ Unique design. Zinc-plated alloy design: leather cover wrapped, non-slip design, the grip does not hurt the hand Hexagonal shank design: 1/4 (6.35mm) shank at the end, safe and firm, not easy to fall off Hexagonal steel sleeve: strong and durable ▶ Wide range of applications. Can be used with electric screwdrivers / electric drill/screwdriver handle Tips: The head and center joint are fixed, not retractable The length of the batch head cannot be changed after the batch head is installed. Length: 80 mm / 3.15 inch, 120 mm / 4.72 inch, 140 mm / 5.5 inchDiameter: 6.35 mm / 1/4 inchWeight: 121 GColor: SilverMaterial: High Speed Steel Package Content: 1 pc 80 mm Telescopic hexagonal joint bar1 pc 120 mm Telescopic hexagonal joint bar1 pc 140 mm Telescopic hexagonal joint bar Warm Tip: Dear buyer, due to the lighting effect, monitor brightness, manual measurement, etc., there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand! Thank you!