ITEM NAME:M365 Scooter Hinge Bolt Repair Hardened Steel Lock Fixed Bolt Screw Folding-Hoâ„–[.Eye-Screw Made in Carbon Steel C45, carbon content of 0.42-0.50%, quenched to a hardness of 30 HRC. Material: Stainless Steel. Fabricated with high precision for perfect fitness. More resistant than original part.