All the screwdriver bits are made of high quality steel with maximize rust and corrosion protection. This set has different bits to meet all your demand in different situation, includes torx sercurity, square, hex, slit, , Triple-cornered , Tri-wing, U-type.Come with 50 screwdriver bits which covers common screwdriver bits specifications perfects for household appliances, parts assembly, furniture repair and more. This hand tool set is small and handy enough to work in confined places / tight spot or spaces, especially in compact places shape corner, lateral surface.1/4 Inch Hex Magnetic Extension Bit:Built in strong permanent magnet(the hole part), shaft holds bit securely, it's great for extending all kinds of long or short screwdriver bits.Magnetizer / Demagnetizer:No batteries or electrical required.To magnetize a tool, simply slide it through the center hole. If you need to de-magnetize a tool, just insert the screwdriver tip in the negative terminal cavity. To magnetize a tool, insert it in the positive terminal cavity.Material:steelcolour:Black + SilverPackage Contents:50 x Batch header1 x Magnetizer/Demagnetizer1 x extension bit1 x Ratchet wrenchOnly the above package content, other products are not included.Note: Light 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.