3/16 Inch Allen Wrench for Any Optical Adapter

This Allen wrench is the proper size to fit the bolts on all of our optical adapters. In the United States, this is a very common size, but our foreign friends often have difficulty obtaining Imperial size tools. So, if you live outside the USA and buy an optical adapter, consider buying a wrench, too. It is light enough to ship for free when combined with your other items.