M3 x 40mm Alloy Steel Hex Bolt Socket Head Cap Screws Black 50 Pcs Product Name : Socket Head Cup Screws;Material : 12.9 Grade Alloy Steel;Color : Black Screw Standard : M3 x 40mm;Thread Dia. : 3mm Thread Pitch : 0.5mm;Thread Length : 40mm / 1.6" Head Diameter : 5.5mm;Head Height : 3mm Weight : 100g;Package Content : 50(+/-2%) xSocket Head Cup Screws