The Pinnacle of Precision & Performance Altra Non-Micro Insert Weight Tool allows for Forward Mass System (FMS) Insert Weights to be added/removed from all Altra inserts and points. Made of 303 stainless steel, these tools along with the insert weights allow for arrow weight customization, which affects F.O.C. and allows you to fine tune your arrow’s total weight and improve down range accuracy depending on your specific bow setup.