Exquisite and high-quality workmanship makes it have high hardness and high torque. The rotatable feature makes it particularly suitable compatible electric drills to screw screws in a narrow environment. The locking device of the interface prevents it from falling easily. And the exquisite long extension of 145mm makes it versatile and convenient to use. Made of carbon steel material, it is very durable to use. The length of this product is 14.5cm, the width is 1.5cm and the height is 1.5cm. It is suitable compatible all electric drills and socket wrenches, with a magnetic head, which can be quickly linked to 1/4" hexagonal shank bits and socket. Item Name: Self-locking Extension Rod Material: Carbon Steel Rotation Angle: 20 Degrees Shank Type: Hexagonal Handle Features: Self-locking, High Hardness, Widely Used Color: Black, Yellow+Black, Black+Silver Color, Red+Black, Rose Red+Silver Color, Antique Silver Color+Yellow Size Details: Size: 14.5cm x 1.5cm x 1.5cm/5.71" x 0.59" x 0.59" (Approx.) Shank Diameter: 0.635cm/0.25" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Self-locking Extension Rod