Square drive, #6 x 1"

US Fasteners

Square drive pan head

Sheet metal screws

Screws with large threads for use in sheet metal sometimes also used in plastic, fiberglass, or wood.
SimpsonĀ® Bugle head wood screws square

Deck screws & Timber screws

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