HIGH QUALITY CARBON STEEL: The screwdriver bit holder is made of high quality carbon steel and CRV, which has high hardness, non-slip, large torque and durable. You can use them for a long time. EXTENSION TOOLS: The screwdriver bit holder is 1 or 4 inch Hex extensions are a set of essential accessories for electric drills and impact drivers, ideal for extending all kinds of screwdriver bits, drills, batch heads, uses conversion screwdriver heads. MAGNETIC DESIGN: The built-in magnetic quick release and magnetic bit holder extension rod will greatly improve work efficiency, allowing you to complete your work easier and faster. It can be a great choice for daily repair or installation work. WIDE APPLICATION: The magnetic quick release bit holder is suitable for electric screwdrivers and is used in engineering, machinery, home appliance maintenance and other production lines. Ideal for working on vehicles, bicycles and furniture, etc. . HIGH VALUE PACKAGING: You will get 9 pieces of magnetic extension drill bits in three sizes, the length includes 60mm, 100mm and 150mm which can meet your different needs. Descriptions: Made of carbon steel Hardened carbon, the bit holders have great strength and durability. Bit extender designed with 1 or 4 inch hex shank, standard size can match most tools. The drill bit holder uses a magnetic design, with a locking mechanism, easy to grip and fix, convenient to install quickly, and greatly improves work efficiency. Specifications: Material: Carbon steel and CRV Color: As picture shows. Size: 150mm, 100mm, 60mm Notes: Allow 1-2mm differs due to manual measurement. Color may have difference due to the monitor difference. Please confirm the size before ordering. Our product is not suitable for children under 3 years old. p> Please feel free to contact us if you have any questions. Package includes: 9 x magnetic extension drill bits. luckymeet