Stainless 5/16-18 X 3/4 Hex Head Bolts (1/2 To 4" Length in Listing), 304 Stainless Steel (5/16-18x3/4(50pcs)) 304 Series Stainless Steel, (18-8) Great corrosion resistance for outside applications 5/16-18 X 3/4 Inch USS Coarse Thread