20 X M4 4x20mm BUTTON HEAD HEX SOCKET ALLEN KEY BOLTS A4 MARINE STAINLESS STEEL
20 X M4 4x20mm. M4 Button Head (Hex) Bolts. M4 Button Head. A4 Stainless Steel. Manufactured from A4 marine grade stainless steel for maximum corrosion resistance. Allen key size: 3mm.