ASU's specialized tool sets will simplify the disassembly, reassembly, and preventative maintenance checks and services (PMCS) of your night vision devices both in maintenance facilities and in the field. The torque drivers are factory calibrated to the torque values proven by goggle manufacturing processes to provide the best lock ring, purge valve, setscrew, and tube retainer ring tightness without over-stressing. Torque lock rinds, purge valves, setscrews, and retainers with these torque drivers/adapters have proven to provide the best means for securing critical NVD parts while eliminating the breakage and thread stripping that is often associated with hand tightening.