12pc Hollow Punch Set in the following sizes: 1/8 inch, 5/32 inch, 3/16 inch, 7/32 inch, 1/4 inch, 5/16 inch, 3/8 inch, 7/16 inch, 1/2 inch, 9/16 inch, 5/8 inch, and 3/4 inch. They are about 3 1/2 inches overall. Great for punching leather, gaskets, and other similar materials. These may need some sharpening for optimal performance.