[DETAIL] ✔ Complete Size Range : 3mm-19mm (metric) / 1/8"-3/4" (SAE) ✔ Anti-Slip Design : Laser-etched size markings won't wear off ✔ Magnetic Insert : Secures bolts during overhead work ✔ Chrome Vanadium Finish : Corrosion-resistant surface treatment Technical Specifications: Ultra-Hard Alloy Steel : Forged from S2 tool steel (58-62 HRC) for maximum torque resistance Extended Hexagon Design : Deep 6-point engagement prevents fastener rounding Precision Machined : ±0.05mm tolerance ensures perfect fit on metric/SAE fasteners Inner Hexagon Compatibility : Works with both external and internal hex applications [ATTRIBUTES] - Suitable For: Metal - Hign-concerned Chemical: None - Origin: Mainland China - Suitable For: Metal - Hign-concerned Chemical: None - Origin: Mainland China