Ar400 min ,ar500 better. Used cutting edges off loaders and earth moving equipment including digger teeth work well. Other than teeth we often used old edges for wear areas on other plant so often not easy to get hold of. Obviously try around local engineers and dealers for replaced ones. Hardest part is mounting them. Very hard to drill and can be difficult to weld too. Bullet impact can crack and break welds pretty quickly. Longer the chain or wire holding them the better for absorbing shock.
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