The Frankford Arsenal Perfect Seat Hand Primer will make sure you don’t over seat and crush a primer again. It features a dial that adjusts the seating depth 1 thousandth of an inch at a time with a total adjustment range of 50 thousandths. Once you have the seating depth set you can squeeze the handle as hard as you want, with the positive hard stop the primer will never seat deeper than the set depth. It comes with 12 shellholders (#1, #2, #3, #4, #5, #7, #8, #9, #10, #11, #12, #19) which will cover 652 calibers and a heavy duty injection molded storage case so you never lose a part and the Hand Primer is always protected. The primer tray holds 100 primers for quick seating of multiple cases and works with small and large primers. The Frankford Arsenal Perfect Seat Hand Primer is designed so you can have the perfect primer seat every time.