Is the VEVOR 4-1/2 inch grinder good for a beginner?

Yes. It is simple to set up, takes common discs and has enough power for cutting and light grinding. Wear eye and ear protection and keep both hands on the tool.

Does it use standard 4-1/2 inch discs?

Yes. It takes 4-1/2 inch discs on the common 5/8-11 spindle, so cut-off wheels, grinding discs and wire cups from other brands fit.

Can it cut rebar, tile or concrete?

It can cut rebar and light steel with a metal cut-off disc. For tile or concrete, use a diamond blade rated for the material and expect slower going than with a larger grinder.

Does it have a variable speed dial?

Most versions are single speed at up to 12,000 rpm with no speed dial. If you need slow speeds for polishing or wire brushing, look for a variable-speed model.

How does it compare with a DeWalt or Makita grinder?

It matches them on paper for power and speed, but those brands offer smoother running, better guards, soft-start and easier service. The VEVOR suits occasional use; the big brands suit daily work.