Swordfish 31400 - 60pc Square Head Set Screw Assortment An excellent assortment of Square Head Set Screws Black oxide finish for extra strength Include 6 sizes of 1/4"-20 x 3/4", 5/16"-18 x 3/4", 5/16"-18 x 1", 3/8"-16 x 3/4", 3/8"-16 x 1-1/4", 1/2"-12 x 1" Organized in a pp storage case with chart inside box lid for quick identification