from steel, which is wear , durability and with high hardness. Suitable for gypsum board, woodworking board, dry wall and more. 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 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! The and nonslip allows the screw to attach to the bit without falling, making your work easy collar limits the penetration of screws to the board and prevents damage to wall or boards by twisting screws overly. Length:.50mm/1.96inch Colour: Material:Metal Package Contents: 5 * Positioning Screwdriver Bits Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.