Sturdy Material: The automatic center punch is made of durable solid brass, comes with deep knurling on the surface, which helps to offer more precise one-handed handling and control Repeatable Impact: The 5 inch spring-loaded automatic center punch can mark a dimpled starting point, the red adjustable impact cap is made of ABS plastic, can be increased or decreased the striking force, the right spring can withstand repeatable impact Usage Steps: Mark the center of the hole you want to make, and press the handle firmly, the strong spring will make the punch spring out strongly, after the punch is pressed into the shank for a short time, it will leave a mark of the hole on the item Package Contents: You will receive 5 pieces automatic center punches in the package with 5 different colors, each color has 1 piece, as the picture shown, you can use or replace them for a long time Wide Use: The automatic center punch is suitable for a variety of tasks, ideal for marking, punching, pricking