Hexagon Head Bolts And Nuts Of Size 20X65 Mm Property Class For Bolts And Nuts. Fo R Bolts As Per Is:1363 Part-1/2002 Property Class Gr.4.6 And For Nuts As Per Is:1363/Part-Iii/2002 Prope Rty Class Gr.5. [ Warranty Period: 30 Months After The Date Of Delivery ] ]