Could you be thinking of:
* A nail clipper: This is a tool used to trim and shape nails, often including a file to smooth the edges.
* A cuticle pusher: This is a tool used to gently push back the cuticle, the skin around the base of the nail.
* An acrylic nail kit: These kits often include tools for shaping and filing acrylic nails.
If none of these apply, please provide more context about what you are looking for.