Patent ID: 7521132

Claim:
A tool, comprising: a base material selected from the group consisting of cemented carbide, cermet, hard material, and tool steel; a coating formed of two or more coating layers and having a total coating thickness of from 0.5 μm to 15 μm, a coating layer having a thickness from 0.0003 to 5.0 μm; at least one of said coating layers having a composition (Ti a Al b Ta c ) N, where: a+b+c= 1; 0.3≦b ≦0.75; 0.001≦c ≦0.30; and at least one of said coating layers having a composition (Ti d Al e Ta f M g )N, where: d+e+f+g =1; 0.50 ≦e≦0.70; 0≦f≦0.25; and M is one or more elements selected from the group consisting of Si, V, B, with: for Si:0.0005≦g≦0.10; for V:0.001≦g≦0.25 and for B:0.00005≦g≦0.01.