Conversion bits in the miniature hobby refer to small pieces or components that can be added to an existing miniature model to modify its appearance or add additional details. These bits can be anything from a new weapon or piece of armor to a different head or accessory, and are often used by hobbyists to create unique and personalized models.
Conversion bits are typically sold by companies that specialize in miniature wargaming or model-making, and can be made from a variety of materials such as plastic, metal, or resin. They are designed to be compatible with specific miniature models or lines, and are often marketed as an easy way to add variety to an army or create a custom character.
Hobbyists often use conversion bits to customize their miniatures to fit a specific theme or aesthetic, or to represent a specific character or unit from a game or story. They can also be used to create entirely new models from scratch, using a combination of existing parts and customized components.