uxcell 50 Pcs 12.9 Alloy Hex Key Socket Head Cap Screws Bolts UNC 4#-40x1" Product Name : Screws;Material : 12.9 Grade Alloy Steel Screw Standard : UNC 4#-40x1";Thread Size : UNC 4#-40 Thread Length : 25.4mm / 1";Hex Key Socket Size : 5/64&ldquo; Color : Black;Weight : 55g Package Content : 502% x Screws