construction: Made of heat treated chrome vanadium steel with an electroplated finish for hardness and durability. 29 piece set: 11 hex ETorx star sockets designed for 1/4 in or 3/8 in drives; 10 bit sockets for 3/8 in or 1/2 in drives; 7 hex bits; 1/4 in hex bit adapter. Broad compatibility and versatility: Ideal for car , bike , and general home maintenance. Suitable for those engaged in relevant work, including handymen, repairmen, construction workers, mechanics, body shops, garages, and workshops. Easy to use: Features visibility markings for quick and easy identification. Practical use scenarios: Car maintenance: remove or install bolts and fasteners across 1/4 in and 3/8 in drive sizes with the included sockets. Bike : service bicycles and components using the hex, ETorx, and star sockets, plus the hex bit adapter for tight spaces. Home or workshop projects: general assembly and tasks in garages or workshops needing reliable hex and bit sockets.