Usage Tips:HIGH QUALITY CARBON STEEL: The screwdriver bit holder is made of high quality carbon steel + 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 1/4 inch Hexagonal extensions a set of must-have accessories for electric drills and impact drivers, ideal for extending all kinds of screwdriver bits, drills, set heads, screwdriver uses. screwdriver head conversion. MAGNETIC DESIGN: Built-in magnetic quick-release magnetic bit holder extension rod will greatly improve work efficiency, allowing you to finish your work easier and faster. It can be a great choice for daily repair or installation work. WIDE APPLICATION: The quick release magnetic bit holder is suitable for electric screwdrivers and used in engineering, machinery, appliance maintenance and other production lines. Ideal for working on vehicles, bicycles and furniture, etc. . HIGH VALUE PACKAGING: You will get 9 magnetic extension drill bits in three sizes, the length includes 60mm, 100mm and 150mm which can meet your different needs. Descriptions: Made of stainless steel. tempered carbon, the bit holders have great strength and durability. Bit extension designed with 1/4 inch hex shank, standard size can fit most tools.</p > The drill holder uses magnetic design, with locking mechanism, easy to grip and fasten, convenient to install quickly, and greatly improve work efficiency. Specifications:</ p > Material: Carbon Steel + CRV Color: As the 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 > Do not hesitate to contact us if you have any questions. Package includes: 9 x magnetic extension bits. </ p > Note: the data of manual measurements, please allow 1-151cm error, due to differences between light and screen, there will be a certain color difference, the specific received in kind prevail.