Hexagonal Head Bolts And Nuts Assembled Having Isi Marked Specification ( 1)Product Grade Cms Black To Is 1363 (Part -1/2002 For Bolts (2) Product Grade Cms Blac K To Is 1363 Part -3/2002 For Nuts Of Size 6 X 25 Mm. [ Warranty Period: 30 Months After The D Ate Of Delivery ] ]