Material: In Case Of Turned Machine Bolts... Free Cutting Brass IS 319 Type (I) or Free Cutting Brass As Per BS 249 Type (I) or High Grade Free Cutting Brass Any Special Brass Material Composition As Per Customers Requirement. In Case Of Cold Forged Machine Bolts... Brass as per IS 4413 or BS 2874/Cz108 or High grade mild steel in case cold forged Machine130ms.