Features: These bits help you fix the screw exactly in place without worrying about wobbling or misdirection. Magnetic collar design limits the penetration of screws to the board and prevents damage to wall or boards by twisting screws overly. The magnetic and nonslip design allows the screw to attach to the bit without falling off, making your work easier and effortless. Make of Black Carbon Steel, which is wear resistant, and with high hardness. Suitable for gypsum board, woodworking board, dry wall and more. Suitable for most electric screwdrivers, manual screwdrivers, electric drills, hand drills, for easy screw installation and removal. Specifications: Component: Black Carbon Steel Length: 25mm(0.98inch)/50mm(1.97inch) Package Includes: 1pc Magnetic Positioning Screwdriver Bit Head note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.