This set is manufactured by Proto Industrial Tools.
Proto Impact Locking Extension Set, 3-Pc., 3/8in. Drive, Model# J7277L

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- Solid one-piece design helps prevent the locking components from becoming loose or disengaged
- Patented locking feature locks sockets to the extension with exceptional force
- Knurled shank provides a slip-resistant grip when hand-turning the extension
- Made in U.S.A.
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