Special Grooves Design: Features side grooves and hollow structure to perfectly avoid shock absorbers wiring and pipelines, allowing direct nut installation without disassembling pipes, solving traditional socket wrench limitations generic Compatibility: Standard 1 / 2 " drive interfaces fits ratchets and power tools, length for easy operations in car repairs and maintenance 12 Point Fluted Inner Hole: 12 tooth design provides larger area than hexagonal sockets, distributing force evenly to nut slippage and protect edges Complete Size Set: Includes 16mm, 18mm, 19mm, 21mm, 22mm, and 24mm sizes to cover most passenger and light vehicle shock absorbers nut, meeting maintenance needs High Strength materials: Crafted from hardened alloy steel with black anti rust coating, resistant to impacts and wear, suitable for pneumatic or ratchets wrenches under high torques, Manufacturer: NVOQILIN