[Magnetic heads] These screwdriver heads are magnetic heads, so they can be firmly attached to the screws. Powerful magnetism, its easy to attract the screw when using [Fixed Ring] These screwdriver heads have a collar used as a stop to prevent the drill from tracking the head of the screw in the Dry wall - Once the collar is in contact with the dry wall, the drill can not move forward. [Adapter Tool] with 1/4 inch hex handle, specially designed to cooperate with any electric drill and wireless electric drill in normal use. [Protective surface] The design of the cap can limit the penetration of the screws and damage the panel, which facilitates the installation of the screws for drywalls. Using these screwdrivers, the screw heads for drywalls will stretch and dig the skin from dry partitions without breaking it. These screwdriver tips are made of high-strength S2 ally steel, very resistant. The tip of the screwdriver has a strong magnetism, which can attract and secure the screw firmly. These screwdriver tips have a necklace that acts as a stop, which prevents the forest from following the head of the screw in the plasterboard - once the collar touches the outer skin of the plasterboard, the drill can not more continue. With a 1/4 inch hex rod, they are widely used in many cordless electric drills or drills. Using these screwdrivers, dry bulkhead screw heads will stretch and dig dry partitions without breaking. Product Alias: Multicolored Magnetic Coil Bit Total Length: 65 (mm) color: multicolor Quantity delivered: set of 5 pieces