Features: Engineered for precisions and durability, this expansion bolt hammer punching features a unique concave head design to prevent thread damage while ensuring secure installations with alloy steel construction. The special concave hammer heads minimizes contact with screw threads, paired with corrosions resistant alloy steel and ergonomic grip for fatigue resistant operations during prolonged use. Ideal for professional installers, HVAC technicians, and DIYer enthusiasts requiring tool for heavy duty anchoring tasks in construction or home improvement projects. Perfect for securing anti theft doors/window, mounting air conditioners, or fastening structural fixtures where precisions and bolt integrity are critical. Combining anti slip ergonomics, enhanced wear resistance, and universally compatibility with power drills, this punching optimizes efficiency in both commercial and residential installations. Specifications: Component: Alloy Steel Size:Approx.150mm/5.91''x18mm/0.71'' Handle:Round,Square Package Includes: 1Piece Expansion Bolt Strikes note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color of the item.