This is a complete set of dimples & dies to work with Flush Rivets (AN426) or other countersunk fasteners with a 100° head. This 4 piece set includes 3/32", 1/8", 5/32", and 3/16” and includes a polyethylene holder. Made from hardened steel with a highly polished face to help create a clean and professional finish. A Dimple die set for sheet metal is typically used where flush fasteners are desired but the material is to thin to drill a countersink hole. In this case a dimple die is used to form an indentation in the metal that is the proper angle and depth for the fastener being used. 100 degree is standard for flush mount rivets and some other fasteners. If unsure check the angle of your fastener before purchasing a set of dimple dies or a countersink. Rotate the rivet squeezers shank to adjust the distance between the dies. THIS LISTING IS FOR THE DIMPLE DIE ONLY! RIVET SQUEEZERS ARE SOLD SEPERATELY!