Forster Accu-Ring Die Lock Ring Black. 001in). Designed mainly for sizing dies the Accu-Ring helps you zero in on what you want the headspace length of your cases to be. The Accu-Ring also allows you to make fine adjustments to bullet seating depths. Specifications for Forster Accu-Ring Die Lock Ring: Manufacturer: Forster Weight: 0.035 lb Color: Black Features of Forster Accu-Ring Die Lock Ring Simple affordable design makes setting your reloading dies in your press much more efficeint The distance of 0.001in is the distance between a long and short reference mark. This distance indicates the up or down adjustment of the die in the Co-Ax Reloading Press. Actual up or down movement of the die is 0.000998in per reference mark which for all intents and purposes is one thousandth of an inch (0.001in) Package Contents: Forster Accu-Ring Die Lock Ring Forster DIE-G-20: Accu-Ring Die Lock Ring Black