Round head square neck bolt *Standard:ASIN *Material:Carbon steel,Stainless Steel *Diameter:5mm-20mm,1/4"-3/4" Round head square neck boltStandard:ASINMaterial:Carbon steel,Stainless SteelDiameter:5mm-20mm,1/4"-3/4"Length:8mm-200mm,5/16"-8"Thread:MM,UNC,UNF,BSWGrade:4.8,5.8,6.8,8.8,10.9 GR.2 GR.5 GR.8Finish:Plain,Zinc,Blank,Nickel,Chrome,H.D.GPacking:Carton,Small Box,Bag,Pallet