Features: 100% brand new and high quality Instant impact with no power required, and just insert the screw driver bit into the magnetic ring, the screw can be easily picked up. Hardened shaft resists corrosion and ensures long-lasting durability. Made of premium lightweight aluminum. These feature strong Neodymium magnets to firmly grasp screws. Get a perfect placement every time. Our metal magnetizer screw rings are suitable for shank electric screw driver bits, can compatible with torx, slotted and other screw driver bits, easy and convenient for you to use. Use for deck building, wood framing, installing plywood and more. Ideal for continuous screw fastening in cramped places and on the dry walls. Strong magnetic bit, super hardness, super batch head. Package Includes: 1 x Magnetic Bit Holder Alloy Electric Specifications: Material:Metal Color: Blue/Gold/Purple/Red External Diameter:1.2cm/0.47inches Internal Diameter:0.75cm/0.30inches Height: 2.15cm/0.85inches Diameter of Base: 1.5cm/0.59inches note: Please allow 0-1mm errors due to manual measurement, make sure that you do not mind before you order.