Rated 4 out of 5Â by williamson01 Easy to knock and drill out
20mm knock out knocks out easily and cleanly. Sides are uncluttered and can be easily drilled out. Enough clear space to allow 20mm and 25mm back nut to seat cleanly.
18 Oct 2016
Rated 5 out of 5Â by dozydave It does the job
An inexpensive product that does the job!
What can I say about a simple back box?
Knockouts can be tricky but take care and it should be OK!
21 Apr 2016
Rated 3 out of 5Â by KC60 Knock-outs can be tricky
Does the job, but some of the ones I used had knock-outs that refused to budge without cutting. The back can crack if you try to knock out without cutting.
31 May 2015
Rated 4 out of 5Â by Leshouches666 Surface box 20mm knock out
Used these to mount thermostats with cable glands in the knock out holes.
I pushed the knockouts from the outside and they broke away cleanly. It requires a fair bit of force.
Good price and fine for what I needed.
11 Dec 2014