Center Punch for Putting Dimples in Gold, Sterling, or Copper Sheet and Metal This Center Punch is perfect for putting dimples in Gold, Sterling, or Copper sheet and metal. Made of high quality tool steel, this Punch will last for years. Size: 4-1/4" x 1/4" Why do I need this item? Sometimes it's difficult to get a drill started in the right spot. This tool will place a perfect dimple so that your drill bit hits the exact spot