This 3pcs quick release magnetic screwdriver extension bits holders are used to join electric screwdriver, screwdriver, screwdriver nozzle, screwdriver head. They are very suitable for electric, pneumatic screwdrivers and other screwdriver bits of power tools, drill extended.Features:High hardness non-slip, large torque long life and durable.The screwdriver head can lock the connecting rod with strong magnetic.Change external six angle into internal six angle - Strong Practicability.Great for exchanging the sleeve and the joint, prolonging the connecting rod.1/4 quick-change hex shanks fit any standard size screwdriver bit, 1/4 impact drivers and hand-held drivers.Widely used in situation of narrow space, to reach the work-place where hands can not reach.Specifications:Color: Silver + BlackMaterial: Carbon SteelShank Shape: Hex ShankSleeve Significant Depth: 11mm / 0.43Diameter of Shank: 6.35mm / 0.25 Diameter of Sleeve: 10mm / 0.39Total Length: 80mm / 120mm / 140mm (3.15 / 4.72 / 5.51)Extension Length: 120mm / 200mm / 240mm (4.72 / 7.87 / 9.45)Quantity: 3pcsItem Weight: Approx. 117g / 4.15ozPackage Size: Approx. 14 * 3.5 * 1.1cm / 5.51 * 1.38 * 0.43inPackage Weight: Approx. 120g / 4.24ozSuitable Applications: Situation of narrow space. Reaching places where hands can not normally reach into.A variety of drill and drivers making these extensions very handy and flexible. Exchanging the sleeve and the joint, prolonging the connecting rod.Package List:1 * 80mm Magnetic Drill Bit Holder Extension 1 * 120mm Magnetic Drill Bit Holder Extension 1 * 140mm Magnetic Drill Bit Holder Extension