3 Piece Dimple Die Set Metal Fabrication Set Kits consists of the following dies: 1-1/4″(1.25), 2-1/2″(2.5), 3″(3.00)Dies are CNC machined from premium Cr steel with a Rockwell hardness of 80. These dies are great for virtually anything you can dream up.Common uses are : Providing rigidity to sheetmetal projects. -Lightening up builds -Dimple die skid plates-front bumper plates-floorboards-foot pedals-footrests and many more uses. -Use the raised side of the dimpled material for added traction on running boards and floorboards. -Or just use them to add that extra RAD look to any projectMore Details: Made for use with a hydraulic press or arbor press. Holes must be drilled before you dimple the materials.(These do not act as punches) We recommend no thicker than 1/8″ material. We recommend lubricants when using the dies.This will reduce die wear and gulling.Metal Flaring Capacity:Mild Steel: 1/8Aluminum: 1/8Stainless Steel: 3/32