Features: Crafted from tool steel with HRC60 hardness, these magnetic screwdriver bit with stand high torques power tool while antislip grooves prevent slip for scratchfree fastening on delicate electronics. The 10 piece set features five lengths (50-150mm) with ±0.01mm precise machined tip &1/4in hex shank compatibility, covering 95% screws from toys to machinery. Ideal for mechanics maintaining automotive parts, technicians repairing laptops/phones, and DIYers assembling furniture, offering professional durability for both cordless drills and manual screwdriver. Tackle rusted screws in engine block, deep set fasteners in appliances, or tiny electronics with the hardened surfaces and magnetic hold – perfect for workshops, garages, and home improvement projects. Engineered with knurled grips and anticorrosion coating, these bit deliver nonslip torques transfer even at extreme angle, making essential for precise tasks like circuit board repairs or cabinet installations. Specifications: Component:Steel Includes: 50mm, 65mm, 75mm, 100mm, 150mm.(Length) Handle Diameter:6.35mm Package Includes: 1set/10pcs AntiSlip Bit note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.