1 Inch Drive, 21mm Square Impact Socket Set – Durable, Performance Tool for HeavyDuty Applications Key Specifications: Drive Size: 1 inch Socket Size: 21mm square, 4point drive Total Length: 80mm (3.15 inches) Quantity: 2 pieces included Socket Type: 4point square impact socket Material and Build Quality: Constructed from hardness 40CR forged steel for exceptional strength and durability impact resistance and wear resistance, designed to withstand torque applications without deforming or breaking Frosted blackened surface finish provides added protection against rust and corrosion, extending tool lifespan Performance Features: 4point square port design ensures a precise fit on squarehead bolts and nuts, delivering a stronger grip and reducing the risk of rounding or slipping Builtin antidrop hole in the base allows secure attachment to the tang of pneumatic wrenches or drivers, preventing pins from falling out during use for increased safety Clearly engraved size markings on the socket surface for quick identification and faster size changes while working Applications: Ideal for removing and tightening squarehead bolts and nuts used in various structural fasteners Suitable for automotive , DIY mechanical projects, construction work, and machinery maintenance for heavyduty environments where secure fastening and efficient torque transfer are essential Benefits: Reduces slippage and damage to fasteners by ensuring grip with the 4point square design Extends service life through quality steel construction and corrosionresistant finish Enhances work efficiency with clearly marked sizes and easy interchangeability Provides dependable performance in demanding conditions, making it a reliable choice for professionals and enthusiasts alike