2PC Automatic Center Punch Strikes Surface Hammer Spring Loaded Window Breaker

2PC Automatic Center Punch Strikes Surface Hammer Spring Loaded Window Breaker Features Durable material. Heat treated alloy steel point Brass body, chrome plated tip Knurled handle for sure grip Automatically strikes a surface with powerful spring action when pressed Features adjustable spring loaded design for variable impact strength and hardened tip for long service life One handed operation, simply adjust to desired spring tension, press firmly against work piece for automatic center punch One-handed operation makes accurate marks without the need for a hammer Manufactured in industrial black and chrome finish with knurled body for extra grip Can be used for vehicle emergencies as a side window rescue glass breaking tool Makes a solid mark. Works with wood, metal, steel, aluminum, brass, copper and more Adjusting tension. Rotate top knob clockwise and counter clockwise to increase or reduce hammer spring tension. Great for punching,