Features: The drill bit extensions in three sizes: 60 mm, 100 mm and 150 mm meet your different needs and allow you maximum control and precision when drilling and screwdriving. Premium Material: The impact drill bit holder is made of high-quality steel, which gives it high hardness. Therefore, it is rust-proof, corrosion-resistant, strong and durable. The magnetic long bit holder ensures effective screw alignment. Features: The bottom of the drill bit holder is equipped with a powerful magnet that allows for quick attachment or removal. The interface has a locking function that perfectly fixes the screwdriver head, preventing falling and improving work efficiency. Easy to Use: The 1/4" hex bit can be easily used in electric screwdrivers, drill bits, and manual screwdrivers. The bit holder makes it easy to grip and fasten screws. It is suitable for fast and accurate application of 1/4" Phillips and Phillips screws. Widely Used: The drill bit extension is versatile and is ideal for a variety of applications such as drywall, decking, particleboard, plywood, wooden frames, construction boxes, and more.