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Masonry multitool blades

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Any good? Are some good-er than others?

I've got to cut some holes for socket back boxes, into brick or deep-joy-breeze-block. I'll stitch drill and use a bolster and hammer to remove the bulk, but I'd like to trim the edges with a blade so as to (fingers crossed) avoid any making good to the wall.
 
i have just put a load of sockets into aerated breeze block and very hard brick
for the channel - i used a grinder in the end
BUT for the backbox - I used a grinder (diamond blade to get the top/bottom and sides - roughly and then i used the multitool - to cut the rest out and SDS drill/chisel to cut the bult out

carbide coated

BUT just a DIYer - not an existing trade sparky - so you may want to wait for their answer
 
I don't need to cut a chase for the cable - basically I'm putting in larger boxes in existing locations.

I don't have an angle grinder, but even if I did I'd not want to use it 'cos of the mess.

Carbide, or diamond?
 

Or if you are just swopping to twin from single?
 
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I don't need to cut a chase for the cable - basically I'm putting in larger boxes in existing locations.

I don't have an angle grinder, but even if I did I'd not want to use it 'cos of the mess.

Carbide, or diamond?
OMG yes, the mess would be everywhere.
 
The ness isn't horrific if you hold a running vacuum cleaner so as to suck all the output dust from the cut where the blade exits the substrate.
A slower running battery grinder helps too, and you can get dedicated cutters that have a housing that goes over the entire cut and has a dust extractor attachment

What's the requirement for deeper boxes driven by?
 
The ness isn't horrific if you hold a running vacuum cleaner so as to suck all the output dust from the cut where the blade exits the substrate
Yep, thats what i do - in fact have 2 Vacs going as i happen to have 2 and as you say mine is a Battery Dewalt grinder
We put tarpaulin over sone items in the room - as i had to so 12 boxes in all it was worth it - probably not for 1 or 2

I put in some of the triple back boxes and single row euromodules as well as some single & double backboxes - spurs and isolator switched
was worth it as much faster and not that deep as the room was going to be plasterboarded anyway
 
I have only used the carbide blades and would not want to cut a box out with them -

They do make Diamond , but never used , the service dept staff are very good and helped me with a few blade types for multitool and also for my Mitresaw and circular saw

 
I have used Saxton diamond blades to enlarge cracks in particularly hard external render. They became blunt so quickly that I resorted to using an angle grinder (with a vacuum hose next to it).

From memory, each blade lasted about 7 minutes.

I was so unimpressed that the next time I need to do that for a customer, I will purchase a smaller/mini angle grinder in the hope that, when working off a ladder it will be easier to work with.
 

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