F.A.S.T. is an arrow squaring tool that will allow you to clean and square your fletched or unfletched arrows just like we do at The Burt Coyote Co. This is the very tool used to precision square the nock end of all Lumen-Arrow shafts. For optimum Lumenok function on your shafts, as well as adding a new level of accuracy to the end condition of you arrow shafts, use this tool. Each unit comes with 4 self adhesive abrasive discs that will true dozens of shafts.