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These are Brass Threaded Inserts from Du-Bro. FEATURES: Brass threaded inserts. The perfect way to put threads into wood & mount engines to wood mounting rails. Threaded inserts make a simple & effective way to make wing hold downs. These can be used where blind nuts are hard to fit. INCLUDES: (4) Threaded Inserts SPECS: Thread Size: 4-40 Length: 7mm kr3/17/03 BOX DIMENSIONS: 2.25" W. X .50" H. X 2.25" L. BOX WEIGHT: .02 LBS.
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