My first ORX reamer has been used many times on stainless steel over the past year and has now only performed well in one area. So it's still good for any other diameter. And it might not wear out if I use more coolant. Unlike thin conical reamers, ORX has no side holes to eject fragments in all directions. Debris comes out the back and mostly bounces off the cartridge (but always wear gloves anyway). worth your money.