ANTI-CORROSION MATERIAL: WORKPRO precision screwdriver sets are made of materials with excellent toughness and stiffness. They are heat treated and have a chrome finish to prevent corrosion and increase durability and strength. No need to worry about leaving your equipment outdoors because our tools are rust-proof PREMIUM CR-V STEEL: WORKPRO precision screwdriver set is made of industrial quality chrome vanadium steel, which is hard and durable. With a black magnetic tip, it effectively prolongs the service life MAGNETIC TOOL SET: It has a magnetized tip to make sure the screw doesn't come off during use. Especially when repairing watches, you don’t have to use your hands to pick up the small screws, just use a screwdriver to attract them, saving a lot of time BUILT-IN MAGNETIZER: Quickly magnetize or demagnetize your screwdriver bits for improved screw-holding and reduced drops. For best performance, re-magnetize regularly, as magnetism can fade with use ERGONOMIC HANDLE: PP + TPR handle has a soft curve, for a comfortable grip. Compact design, lightweight, small size, and bag make storage and transportation more convenient. Thanks to the ergonomic design of the handle, even if you work for a long time, your fingers will not feel pain STORAGE CONTENT: The storage case can store the screwdriver well and prevent it from being lost. The set includes different sizes of star, flat, and phillip screwdrivers. Contains SL: 1.5×2.5", 2.0×2.5", 2.5×2.5", 3.0×2.5"; PH: PH000×2.5", PH00×2.5", PH0×2.5"; Torx: T5X2.5", T6X2.5", T8X2.5", Weight: 0.6393405598 pounds, Manufacturer: Hangzhou Great Star Industrial Co.,LTD.