Starrett HSS Bi-Metal Hole Saw - CSC20 Cordless Smooth Cutting Hole Saw - For Wood Plastics Steel Various Materials - 20mm

Best hole saw you can get as a Electrician.

Brillant drill bit great value makes job easier

This is 11/10 for plastics, but using these for Gypsum or other metals you’ll find the teeth missing since it’s a thinner alloy than normal combi starett bits.The pop out mechanism works wonders, it’s quick and you never have to pick out old cut outs.Like the title says: 11/10 for plastics 7/10 for metals.

All okay

Good hole saw used for cutting holes in sheet metal last a good few cuts if used correctly

Great little holesaw, good for getting into small spaces and the shoulder saves catching anything by mistake.

Good clean cut, so top marks there.However, be mindful of the material you're cutting.Even soft metals like aluminium, or plastic seem to blunt the blades quickly.Still cuts, but it takes longer now.

Whilst I do think that Starrett cutters aren't what they used to be, I've had a couple of these to drill steel enclosures as I manufacture control panels. If I use a lubricant or cutting fluid the cutter will do about 5 or 6 control panels, with about 15 holes in each. I find you also have to keep the spring around the pilot drill clean and well lubricated for it to eject the cut-out. Even then you have to prise it out most of the time. So it's not perfect but it's as good as any out there, and better than most