" My DIY Job - To remove grouting arround tiles in shower. " I ordered direct from you carbide coated blades but unknown to me you sent me diamond coated. You do not label carbide or diamond on the blades. The diamond coating wore away in some areas of the blade too quickly. I then ordered via eBay 3 more Diamond coated blades from you. Again the diamond coating wore away immediately in some areas of the blade on the first of the 3 blades. In the areas of the blades where the coating dosn't quickly wear away i can manage to do the job ok, but these areas are limited. This means the life of the blades i am using as been limited and I feel this is because of inconsistent coating adhesion on the blades. I am now wondering, if you had sent me carbide as ordered by me in the first place I may have got better blade life. I am reluctant to buy more blades but would like to try carbide coated blades. Regards Graham Forster