Description: These extension holders are made of high-quality metal with sturdy construction to ensure durability and efficiency. They are covered with an anti-proof cover, and the cover is separated from the holder body so that you can hold the cover while using electric screwdrivers, to prevent shaking. They can be used for a variety of drivers, making these expansion holders very practical. Features: Carbide metal holder for durability, the sturdy construction allows for a long service life. The bit holders are designed to be extendable and can be extended with a simple pull. The 1/4-inch quick hex shank and 1/4-inch hex socket fit most electric screwdrivers, hand screwdrivers, and bits. The small size allows you to take your bit extender anywhere to perform any job and fits in many tool bags. Very useful for removing or tightening a large number of screws after starting or loosening them. Specifications: Main Material: 08F Iron, Aluminum Hex Shank: 1/4" Hex Socket: 1/4" Retracted Length: 80mm(3.15"), 120mm(4.72") Extended Length: 120mm(4), 0.72"), 200mm(7.87") Quantity: 2 Package Includes: 2 x Extension Holder