Ask what coating is being proposed
Terms such as diamond-hard are not a complete process specification. Ask for the actual coating system, material, deposition method and application evidence.
Compare working requirements
Review the substrate, allowed processing conditions, coating allowance, friction or wear duty and final finish. A description of hardness alone does not decide suitability.
Check production and repair implications
Ask about preparation, masking, final finishing, inspection and whether the part can be recoated when worn. Keep the same acceptance criteria when comparing alternatives.
Confirm the offered capability
Share the base material, component drawing, working area, dimensions, coating requirement and inspection criteria. Suitability and the finishing route must be agreed for the actual component. This overview does not establish that DVS provides DLC or other specialist deposition processes.