Simply insert the screwdriver bit into the magnetic ring, and the screwdriver head is instantly magnetized and can really hold the screw, easily pick up the screw, and does not fall. Our magnetizer ring is made of stainless steel, magnetic fast, skid-, and great wear-, exquisite workmanship, high precision, anti-impact, and no damage to the screw and the screwdriver head. Leave the magnetizer on the tool for extra magnetic strength. Instant magnetization, strong magnetic effects, stay magnetized permanently. Perfect for any occasion when needs to add screws. Screwdriver magnetic ring allows the user to quickly and easily magnetize small tools and screwdrivers, they attract screws, nuts, or metallic particles for easy starting and removing. This magnetic screw ring can catch the screw easily and quickly, and fix it to prevent the drill bit from slipping and improve the work efficiency. Quantity:4PCS Color:Blue Material:Metal Package Contents: 4 * Magnetizer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.