The blade is made of alloy steel and has excellent durability and strength. The grip is nearly round and has no orientation, and is designed to be easy to grip in any situation. In addition, it is safe and difficult to lose because it has a fall prevention cord mounting hole. The joint-removing type has a thin and angled cutting edge that is ideal for removing joints. The flat type has a thinner cutting edge than conventional products, and is ideal for repairing all types of tiles such as interior tiles, exterior tiles, and floor tiles. The chisu type has a thinner tip than conventional products, and is ideal for repairing all types of tiles such as interior tiles, exterior tiles, and floor tiles.