Features: Brand new and high quality These bits help you fix the screw exactly in place without worrying about wobbling or misdirection. Speed up the process of twisting screws so you can work more efficiently and easily! Magnetic collar designed limits the penetration of screws to board and prevents damage to wall or boards by twisting screws over. The magnetic and non-slip designed allows the screw to attach to the bits without falling off, making your work easier and effortless. Made of strong chromium vanadium steel, which is wear resistant, durable and with high hardness.Suitable for gypsum board, woodworking board, drywalls and more. Widely suitable for electric screwdrivers, manual screwdrivers, electric drills, hand drills, etc. Specifications: Material:Chromium Vanadium Steel Type:25mm/50mm/25mm+50mm Package Includes: 3 Optional Package: Package 1 Include:1x 25mm Screwdriver Bits Package 2 Include:1x 50mm Screwdriver Bits Package 3 Include:1x 25mm Screwdriver Bits 1x 50mm Screwdriver Bits note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.