C80 shim steel. 
"C80 shim steel from Harper Steel Strips offers high-carbon precision, ideal for applications requiring durability and resilience."  
https://www.harpersteelstrips.....com/c80-c62-c55-grad
 
        
    
 C80 shim steel. 
"C80 shim steel from Harper Steel Strips offers high-carbon precision, ideal for applications requiring durability and resilience."  
https://www.harpersteelstrips.....com/c80-c62-c55-grad
