uxcell M3 x 20 Hex Bolt Socket Head Cap Machine Screws Black 100 Pcs Product Name : Socket Head Cap Screws;Material : 12.9 Grade Alloy Steel;Color : Black Screw Standard : M3 x 20;Thread Dia. : 3mm;Thread Pitch : 0.5mm Thread Length : 20mm / 0.8";Head Diameter : 5.5mm Head Height : 3mm;Hex KeySize : 2.5mm Weight : 122g;Package Content : 100(+/-2%) x Socket Head Cap Screws