WSNTLG Series - #8 wood screw, 2/3 rolled, twin threads, sharp point, flat head, nibs, N2000 galvanized coating. DTHG Series - #8 deck screw, coarse thread, type 17 point, trim head w/ nibs, Quik Guard or TufCote corrosion protection. WSCTC Series - #8 deck screw, 2/3 rolled, coarse thread, sharp point, flat head, nibs, TufCote corrosion protection