These are the best quality made in the USA dimple dies available. Raised Recess Dimple Dies are just like the old ones you would see on a car from the thirties. They create a raised bump upward and have a countersunk bottom that is designed to work with standard 82 degree countersunk fasteners. The shape these make allows you to use a countersunk fastener without any clearance issues on the bottom side of your panel. The set comes with #8, #10, 1/4, 5/16, and 3/8. CNC machined from 4140 Pre-hard alloy steel. Made in Texas!