This useful garden tool is called a dibber. It is designed to make holes in the soil so you can plant seeds and bulbs with minimal disruption to the soil and at the right depth.
Using a normal sized trowel or spade often creates a much bigger hole than required. With this tool you can easily and quickly make a small hole to the plant in.
Little young plants and bulbs get a better start to life with minimally disturbed soil. It also helps if you plant them at the desired depth, especially bulbs. With a specially pointed metal tip featuring 1cm increments, you can plant any seed to its required soil depth.
This is a useful tool for the keen gardener.