Du-Bro 391 4-40 Threaded Inserts

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This is the Du-Bro 391 4-40 Threaded Inserts These brass threaded inserts are the perfect way to put threads into wood and mount engines to wood mounting rails. Threaded inserts ma ke a simple and effective way to make wing hold downs and can be used where blind nuts are hard to fit. These useful fasteners can also be used in woodworking and furniture building. 4/pkg Show more