Suitable for electric screwdrivers, manual screwdrivers, electric drills, hand drills., for easy screw installation and removal. Suitable for maintenance and installation of equipment for home furnishing industry The and nonslip allows the screw to attach to the bit without falling, making your work easy These bits help you fix the screw exactly in place without worrying about wobbling or misdirection. the process of twisting screws so you can work more efficiently and easily! from steel, which is wear , durability and with high hardness. Suitable for gypsum board, woodworking board, dry wall and more. collar limits the penetration of screws to the board and prevents damage to wall or boards by twisting screws overly., Manufacturer: PokFhgur