Harlequin Collar

Okay this is another one I can't link to due to flash inaccessible peril, but its quite awesome.  Fetish N Leather make a collar called the "Harlequin Collar", from the main site select "Store", then "Collars" then check the Harlequin Collar

Fetish n Leather

Molloss

Okay totally worth viewing for the introductory flash if nothing else, one part shakey-cam one part disturbing music video background, sadly this means its deep linking and accessibility fail as far as I can tell.  The collars themselves also appear to justify the atmosphere on the site, looking robust and beautifully industrial.

Molloss Master

Vegan Collars

Okay so some people who like collars dislike using animal products (which in my opinion means they should go for metal Mmmm metal) however if they want something nice and flexible what are they to do?  Well the people over at Vegan Erotica believe that being kinky and being vegan are not incompatible:

Vegan Erotica Collars

Dungeon Delights, Red goodness

Next up is an interesting collar in terms of colour scheme, both metal and bright metallic red.

Simple Elegance Collar 1 inch wide with 1 Ring

Valkrie armour

Okay so I have to admit that this link isn't a collar, its one of my occasional links to other stuff thats kind of kink related and interesting.

Spark Corset

Steel DeSade

Next up is another manufacturer of flat steel collars, Steel DeSade, who seem to offer an awesome range of stuff.

Main Steel DeSade homepage  (direct link to collars frame)

Tollyboy

Well to continue the interesting collars selection I present to you the rather interesting looking locking flat steel collars of Tollyboy, another manufacturer based in the UK:

http://tollyboy.com/business/languages/collars.php?lang=english