Drum LocksIn house content monitoring and drum relocation Staging areas for waste chemicals; Made of corrosion resistant, non sparking zinc die cast, the units easily install around the drum bung flange with no risk of cross threading.; Place both halves around the bung lip, slide the lock bar through the halves and then attach a padlock through the end hole of the bar.; Sold as a pair, these drum locks fit the most popular style of steel and plastic 55 gallons