This is the most simple type of grinder.
It has two parts, hence its name.
You have the lid and the body where you put in the buds.
The inside part of the body is laid out with sharp spikes that act as teeth to grind the weed.
The only downside to this is that since it only has two chambers, the kief mixes with the ground buds making them harder to separate.
There are also times wherein the buds and kief get stuck on the rim of the grinder which you would need a scraper to extract it.
Two-piece grinders are more affordable compared to other grinder types.
These grinders are often made from wood, plastic, or metal.
Wooden and plastic grinders are more affordable compared to metal ones.
But overall, metal grinders are more durable.