Get these Magnetic Positioning Screwdriver Bits which will help you fix and twist the screw accurately, and limit the penetration depth of screw in order to protect walls. This screw setter is made of shock resistant tool steel for maximum durability and it is ideal for controlling the depth of screw during driving applications in drywall, particle board or plywood. No messy work anymore! Making your work more efficient and effortless! SPECIFICTIONS Material: Chrome Vanadium Steel Size: 25x15mm, 50x15mm Interface to Electric Drill/ Screwdriver: 6.35mm/0.25” Hexagon Shank Package Includes: 5pcs x 25mm Bits 5pcs x 50mm Bits 3pcs x 50mm Bits + 2pcs x 25mm