A grinder is an item used to grind down tobacco leaves or herbs. A grinder is made up of two hollow halves which perfectly fit together in a space where the product, be it tobacco or herbs, can be placed.
Grinders are objects that are used for grinding up your product into a powder-like substance, making it easier to roll into pre-rolls. The basic models are made up of two halves, with some metal spikes or “teeth” but they can be made of many different materials due to how many different models there are available.