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The 1/4-28 UNF x 3.1/2 inch Socket Button Screws (ANSI B18.3) - Black Stainless Steel (A2) has the following features:
Imperial Socket Button Screws feature a large, rounded head, often chosen for its aesthetic appeal. Button Head Screws with a socket drive can be installed using a Allen Key or Hexagon Drive Bit.
Socket Button Head Screws are available in imperial thread sizes ranging from No. 0 to 1/2 inch. Lengths are available between 1/8 inch and 1/2 inch.