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3-1/2", Square drive

US Fasteners, 3-1/2", Square drive

Square flat head nibs

Wood screws

Screws with a smooth shank and tapered point for use in wood.

Simpson® Bugle head wood screws square

Deck screws & Timber screws

Screws for wood to wood fastening applications such as decks, docks and ledgers, etc.

Associated Products, 3-1/2", Square drive

Square drive bits

Driver bits

Driver bits are available in various drive types and bit styles.