50Pcs M3 x 40 Alloy 12.9 Steel Socket Hex Pan Head Screws Knurled Cap Screw Bolt Metric Fully Threaded Black Socket Head Cap Screws Made of Alloy 12.9 Steel , dependable, rigid strength ,corrosion resistant quality. These qualities making these screws and nuts virtually indestructible. 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