Features: 1. Made of metal, good workmanship, high precision. 2. Each edges can be accurately locked screws, no damage to the screws and the screwdriver head. 3. Anti-impacts and durable, great wear resistant. Precision Screwdriver Fit for electric screwdrivers, hand screwdrivers, electric drills, air drills and so on. 4. As a Extension bar, insert into the handle to lengthen the tool handle, which is great helpful for when you meet deep set screws. 5. Different colors and sizes optional, great accessory for screwdriver. Notice: 1. Actual color may be slightly different from the image due to different monitor and light effect. Please allow minor deviation due to manual measurement. Specification: Type: Screwdriver Magnetizer Ring Material: metal Size: as picture shows. Note: Black inner diameter is 1mm smaller than other colors Instructions: 1. Insert the magnetic ring into the 6.35mm bit to connect. 2. Confirm that the magnetic ring is fixed on the batch head. 3. Place the screws on the bit after insert the magnetic ring. 4. Strong magnetic prevents the screws from falling off. Package List: 1 x Magnetizer Ring