100 Pcs 12.9 Alloy Hex Key Socket Head Cap Screws Bolts UNC 4#-40x5/8" Product Name : Screws;Material : 12.9 Grade Alloy Steel Screw Standard : UNC 4#-40x5/8";Thread Size : UNC 4#-40 Thread Length : 15.88mm / 5/8";Hex Key Socket Size : 5/64&ldquo; Color : Black;Weight : 76g Package Content : 1002% x Screws