Description: High Quality Material: Automatic center punch tool is made of high carbon steel, sturdy and durable, spring is made of stainless steel Easy to Use: align the tip of the automatic hole punch with the center of the hole, and press the handle to the punch direction to mark Adjustable: The spring loaded center punch with tension screws, you can get variable impact strength by just rotating the cover, adjust the best tension applied to the work Practical Center Punch: Center punch tool can be used to mark the center of a point on a metal or wooden board. The dent can drilling the hole and prevent the drill bit from slipping or tilting Multi Function: center punch tool can not only be used for marking and positioning wood, plastic, metal and other materials, but also as a rescue tool for emergency survival when need to broke the side window glass in a vehicle emergency Specification: Material: Shell material: high carbon steel Spring material: stainless steel Size Chart: (optional) For 128mm,Diameter 12mm For 155mm,,Diameter 15mm Package Includes: 1 Piece Automatic Center Punch(4 Pack) Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful online shopping!