diameter

I'm trying to track down a replacement for a ceiling light I believe was originally fitted to my bathroom in the late 90s. There are two lights but the cover from one is missing and I've had no luck in sourcing a replacement. The diameter is 30cm and here are a couple of photos: Thanks in...

Easydrive seem to be a bit shy of providing hole spec.. The 6x100 have 6mm thread diameter, slightly unsurprisingly (with 4.8mm shank). They're going in to a concrete blockwork wall. Is there a general rule for hole sizes? Thank you Dain

I am in France, so I realise that fittings etc. may well be different here. I have read that the supply pipe diameter for a washbasin should be 12mm and for a shower 16mm. The hot and cold feeds to my bathroom are 14mm copper pipe, and I don't want to have to redo the entire run. I'm intending...

I'm looking to make an extension lead of over 60m to run a well pump of of the generator after storms or other power cuts. It needs to run the pump which is rated at 2400 Watts. What diameter cable is needed for this to allow for power loss over distance.