By applying a coating to a tool it allows the user to often substantially increase speeds and feeds while minimizing wearing to the tool.  So that you may choose the best coating for your particular application please make use of the following more common coating to select which would best suit your needs

Titanium Nitride (TiN)
The general-purpose coating for cutting, forming, injection molding as well as tribiological applications.

Titanium Carbonitride (TiCN)
Conventional carbon nitride coating:
• For interrupted cutting
• For milling and tapping
• For stamping, punching and forming

TiAIN
The new universal high- performance coating for cutting (drilling, milling, reaming, turning). Also suitable for dry machining.

Aluminum Titanium Nitride (AlTiN)
Special high-performance coating for dry high speed machining. AITiN performance surpasses all conventional coatings when machining cast iron and hardened steel.

• CBC: carbon-based coating
• DLC: diamond-like carbon
Special gradient coating. Self-lubrication as its own coating or on the top of an appropriate hard coating.