After using armorer wrenches from various manufacturers, we set out to develop a wrench that far exceeded the fit and finish of those currently on the market. What you see is months of designing, testing, redesigning, and checking fitment with multiple manufacture parts. Weaponwerx offers two versions; AR15 only and combo wrench (designed to accommodate most .308 AR platform parts). All wrenches are proudly made in the USA, using carbon steel coated with a mil spec anti-corrosion coating. Each carry a lifetime guarantee against breakage. This will be the last tool you will buy for maintenance and customization of your rifle. Please contact us with any questions.