These universal drum plug wrenches come in three different options - cast (ductile) iron, manganese-bronze or aluminum-zinc. Standard is the cast iron and it will open virtually all drum plugs. However, if you have a need to avoid potential spark, working with flammables, you may want to look into the spark-resistant styles. Each of these wrenches has an offset handle to help prevent injuries. When you need to access the inside of your drum, there is nothing like a good drum wrench to help you get past those plugs. Check out these three options and choose the one that will help you the most.