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Just wrap insulation tape around the smaller hole saw and place it inside the bigger hole saw.

It'll give you a step between the two sizes.

I've had to do this, when we were upgrading machines and they needed a bigger gland

There's always a way of getting around any problem; I just thought it was ironic buying one of those arbors and since then not needing to enlarge a hole.
 
The Bosch quick change ones are quite nice (if expensive) - Avoids the hassle trying to get any other brand off the damn arbor after the plaster has got into all the joints....
 
I'm ok with the step drill bit just know I'll get that 1 occasion that needs a downlight holes made bigger ? sods law ain't it
for downlights it's only plasterboard. i use a set of shallow bits. cost a tenner for arbour and 6 cutters up to 80mm with all the popular downlight sizes .similar to this, but mine are red.
 
I can’t justify the price of the Armeg ones unfortunately. Dart any good? Or the DeWalt ones I posted? Starrett seem to have mixed reviews.
They'll all have mixed reviews, I doubt you'll find one brand that everyone loves. I've used my starretts for about 7 years now and they are still fine. They have had medium to low use over that time.
 
I needed a 32 in a hurry on a job and didn't have my Staretts - local hardware shop in Clerkenwell had a Reisser, I've not looked back since and am replacing all my stock as they wear out for Reissers.

Also have the Bosch quick-change set but just find they go blunt really quickly so stopped bothering with them years ago for anything other than light weight or plasterboard work.
 
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RDB85

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Hole Saw Set recommendations
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Electrical Tools and Products
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RDB85,
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Rockingit,
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