Features: Suitable for the transfer of drill bits, screwdrivers, bits, etc. Expansion of various types of 1 or 4" screwdriver heads, screwdriver head conversion use. Made from high quality steel, this extension drill driver sleeve adapter ensures durability and long lasting use. Suitable for professionals of mechanical repairs and individual who require reliable screw tightening solution. Perfect for various applications such as automotive repairs, furniture assembly, and electronics maintenance. Expand your tool collection with the versatile 1 or 4" Magnetic Bit Holder and enjoy convenient screw tightening in any situation. Specifications: Material:Chrome Vanadium Length:Approx.5cm or 1.97'',6cm or 2.36'',10cm or 3.94'',15cm or 5.91'',30cm or 11.81'' Quantity:1,5 Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1Pc or 5Pcs Magnetic Bit Holder