Industrial Grade S2 Steel Bits Material and durability: Made of quality S2 tool steel with hardened and tempered construction. Wear resistant and durable, designed for long time use. Precisely fit and remove torx screws with no hassle, and match most standard tamper resistant star screws. Size range and dimensions: 14 Pcs precision screwdriver set. Includes sizes T5, T6, T7, T8, T9, T10, T15, T20, T25, T27, T30, T35, T40. Our precision torx star bits measure 28 mm in full length and 4 mm in diameter. All hexagonal star torx bits in this kit are metric and suitable for most size torx bolts and screws. Identification and organization: Size marks are stamped on bits and printed on the bit organizer for quick identification. Keeps the kit organized and ensures fast bit selection. Compatibility and performance: All hexagonal star torx bits are metric, and the set is suitable for most size torx bolts and screws. Designed to work reliably with a wide range of torx fasteners. Wide application: The T5 to T40 torx bits set can be widely used for engines, automobiles, motorcycles, bicycles, Stihl chainsaws, trucks, furniture, and other equipment with torx screws. Use scenarios Automotive and engine work: remove or install torx screws in engine bays and chassis components. Motorcycle and bicycle maintenance: service parts and assemblies that use torx fasteners. Furniture assembly and : tighten or loosen torx screws in inhouse or workshop furniture projects.