Superior Material: The drywall drill bit is made of high-quality S2 alloy steel, with better wear resistance and impact resistance. Strong Magnetic: The drill bit has strong magnetism, so it can easily absorb the screw, which is convenient to use. Design: The magnetic collar design limits the penetration of screws into the board, which can protect the board from damage. Wide Compatibility: The 1/4 inch hex shank is widely compatible with electric screwdrivers, manual screwdrivers, electric drills, hand drills, etc. Package: 10 placo screwdriver bits included. The length of the screwdriver bit is 50 mm/1.96 inch.