What is classed as wear and tear?

Damage that happens to a tool in ordinary use over a period of time.

This includes carbon brushes, sanding pads, abrasive sheets, saw blades, router bits, rubber sleeves, stirring rods, cutting blades, cutting accessories, drill bits, Plug-it-cables but can also affect Gear boxes and motors that have been used over a long period of time.

Critical for the assessment is not the age of the tool but how many hours it has been used and the overall condition of the tool.