uxcell 100 Pcs 304HC Stainless Steel Countersunk Hex Key Bolt Screw M4x20mm Product Name : Countersunk Bolts;Material : 304HC Stainless Steel;Type : M4 x 20mm Thread Dia : 4mm / M4;Thread Length : 20mm / 0.8";Head Dia : 8mm / 0.3" Fit Hex Key Size : 2.5mm;Head Type : Flat Head Head Socket : HexType;Color : Silver Tone Weight : 185g;Package Content : 100(2%) xCountersunk Bolts