3/8x8 in. GRK RSS Washer-Head Screw, Climatek, Star-Qty:50
GRK RSS Rugged Structural Screws 5/16 x 4" Lag Screw Alternative 40 Qty. | eBay
21 Screws per Order HandyPak 5/16 by 4-Inch Structural Screws GRK ICC-ESR-244 | eBay
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)
GRK Fasteners 3/8 in. x 12 in. Star Drive Low Profile Washer Head RSS Structural Alternative Lag Screws (50-Pack) 12299 - The Home Depot