20x Stainless Steel Countersunk Hex Socket Knurled Bolt Screw M4x20mm Product Name : Countersunk Bolts;Material : Stainless Steel;Type : M4 x 20mm Thread Dia : 4mm;Thread Length : 20mm;Head Dia : 7mm Fit Hex Key Size : 3mm;Head Type : Pan Head Head Socket : HexType;Color : Black Weight : 50g;Package Content : 20 xCountersunk Bolts