Features: *Accurate Positioning: 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 *Limit The Screw Depth: Magnetic collar design limits the penetration of screws to the board and prevents damage to walls or boards by twisting screws overly. *Magnetic Non-slip: T he magnetic and non-slip design allows the screw to attach to the bit without falling off, making your work easier and effortless. *Strong and Durable: Made of strong chromium vanadium steel, which is wear resistant, durable and with high hardness.Suitable for gypsum board, woodworking board, dry wall and more. *Wide Compatibility: Widely compatible with electric screwdrivers, manual screwdrivers, electric drills, hand drills, etc., for easy screw installation and removal.Suitable for maintenance and installation of equipment in home furnishing industry. Specifications: Product Name:Drywall Screwdriver Bit Material: Chrome Vanadium Steel Color: Silver (As Pictures Show) Size: (Approx. ) 25x15mm, 50x15mm Interface to Electric Drill/ Screwdriver: 6.35mm/1/4 Hexagon Shank Application: installation of plasterboard / drywall screws, etc. Quantity: 8pcs set Package Included: 8 Drywall Screwdriver Bit (4*25mm+4*50mm) Note: 1.Transition: 1cm=10mm=0.39inch. 2. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 3. Please allow slight manual measurement deviation for the data.