Malleable Iron Combination Locknut Wrench

This is a vintage Chicago Specialty MFG. Co. Combination Locknut Wrench No. 3008. Function: This tool is designed to tighten or loosen locknuts, particularly in tight spaces. Manufacturer: Chicago Specialty MFG. Co., established around 1932. Usage: It is often used in plumbing for closet spud nuts or in industrial sanitation settings for sanitary nuts. Cool vintage tool!