These bits help you fix the screw exactly in place without worrying about wobbling misdirection. Speed up the process of twisting screws so you can work more efficiently and easily! The and non-slip designed allows the screw to attach to the bits without falling off, making your work easier and effortless. collar designed limits the penetration of screws to board and prevents damage to wall boards by twisting screws over. Made from stainless steel, which is wear resistant, and with hardness.Suitable for gypsum board, woodworking board, drywalls and more. Widely suitable for electric screwdrivers, manual screwdrivers, electric drills, hand drills,, Manufacturer: AYPOHU