The word lime means different things to different industries. In agriculture, it may refer to lime stone or to slaked lime. You have to take care to understand what you are getting. This bag is actually slaked lime. Slaked lime is also used in making pickles.
Sodium hydroxide is sold as lye in the drain opener department of many gorcery and hardware stores.
Most solid drain openers contain lye plus other ingredients. Still, it doesn't intentionally contain anything but sodium hydroxide. Another synonyms for lye is caustic soda .