GRK 5/16 X 5-1/8" Structural Screw (96010) FS | eBay
GRK 772691122353 12235 5/16" x 6" RSS Rugged Structural Screws 50 Count, No Size, Gold - Collated Screws - Amazon.com
GRK Fasteners 772691-12221-6 $62.37 - #5/16 x 3 1/8"L RSS Rugged Structural Screw, Handy Pak (100 Pieces)
ITW GRK Fasteners 12217 RSS Rugged Structural Screws 5/16 Inch By 2-1/2 Inch Washer Head 100 Pack: Exterior Structural & Truss Head Screws (772691122179-1)