These Automatic Centre Punches have knurled grips and create indentations simply by pressing them down into the material. They do not need to be struck with a hammer. Features & Benefits • Hardness 56-61 for the tip • Bronze shaft Specifications • Diameter: 6mm • Trigger Load: 12.2 to 18.5kg • Length: 151mm • Thickness: 17mm • Width: 26.7mm • Weight: 133g