Features: Resistant to impact and not easily broken, easy penetration through steel plates, more wear-resistant Steel forging overturns traditional batch head high hardness steel farewell to batch head easy to collapse Highly suitable for the screw, doesnot slip when tightened and tightly engages with the screw without slipping Antislip design, finely manufactured, and screw engagement are tighter to prevent slipping and collapse Surfaces rusts resistance treatments is less prone to rusting. Experimental soaking in water for one week result in less rusting. Outdoor work is more practical Specifications: Material: Steel Specifications:50mm,65mm,75mm,100mm,120mm,150mm Package Includes: 6Pcs Screwdriver Bit note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color.