If you need a tool that can be used in a variety of applications, the Eklind 19604 Metric Plain Double-Ball-Hex Key is an excellent choice. This double ball hex key has a 2 mm tip size and an arm length of 3 29/32 in. The alloy steel blade offers durability and strength. It has a black oxide finish for added protection against corrosion. The plain handle offers better grip while working with small fasteners. If you are looking for a Hex Key that will meet your needs, the Eklind 19604 Metric Plain Double Ball Hex Key is just what you need.