The drill bit extension is made of industrial heavy-duty carbon steel, offering greater hardness and a longer service life. This magnetic bit holder features a non-slip sleeve and a separate rotating shaft design, and the sleeve can be slid and extended. The drill extension bit holder has a standard 1/4-inch hexagonal interface, and the slight magnetism at the bottom of the interface ensures that the screwdriver is securely fixed in place. To use, simply insert the screwdriver bit into the bit holder for the impact driver to replace the bit. Hold the outer sleeve with one hand and the electric drill with the other to quickly and precisely position the screwdriver bit, improving work efficiency. The quick release bit holder is compatible with most 1/4-inch screwdriver or hex wrenches, among other accessories. The hex handle of the impact bit holder itself is 1/4-inch. The 1/4 bit holder is only suitable for installing screws to prevent excessive wobbling of long screwdriver during rotation. The drill extension is compatible with electric screwdrivers, pneumatic screwdrivers, manual screwdrivers, t-handle 1/4-inch screwdrivers, corded drills, cordless drills, pneumatic drills, impact drills, or any other equipment with a 1/4-inch hexagonal handle. The bit extension is ideal for maintenance, repair, and DIY work in automotive, hardware, home, or other fields. Includes 5 impact extensions, featuring 2 lengths: 3 x 3.1 inches (80 mm), 2 x 4.7 inches (120 mm). Whether for simple household projects or complex professional tasks, this drill bit extender is the perfect tool . Color:As Shown Material:Metal Package Contents: 5 * drill bit extension Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.