UPDATE: It seems that the price has gone up to £25 now so you are too late
.....
I just bought 8 boss head clamps https://www.ebay.co.uk/itm/8x-LAB-STAND-BOSS-HEAD-Clamp-Hold...
they arrived today so I can only give a cursory review;
they take up to 18mm diameter rods, my 10mm and 14mm rods are held tightly.
The body is nominally aluminium alloy and it bends much less than the zinc alloy types when tightening.
They 'feel' OK
Like I wrote, I have not tested these in long term use but at £12.73 incl.international p&p for eight
I thought I'd mention this them whilst available at this price.
[Edited on 13-2-2018 by Sulaiman]
[Edited on 13-2-2018 by Bert]j_sum1 - 13-2-2018 at 03:23
Thanks. They look good and I need some new ones. Unfortunately I have to hold the purse strings tight at the moment.
Watching anyway.DavidJR - 13-2-2018 at 05:09
If you're in the UK, Rapid Electronics will sell you them in packs of 5 for just over a pound each.