Some years ago, in about 1988, I bought a pair of the castors that you mention. I still have them. I don't know if they are still available or not, but I'll give you all the information that's on the box. They are called "Easy Rider Rollers", they cost �7.50, they are a Braby Bristol product, they are made in England, patent no. is 1350507. I put them under a washing machine when I was tiling our kitchen walls, because I had to keep moving the washer away from the wall to do the tiling. They were very useful. They have a brake so that they won't move about when the washer is running. I have looked in an Argos catalogue, but there's no sign of them there. I bought mine from a hardware shop, the sort of place that sells everything. I've just Googled Braby Bristol. Here's what I found: Braby Group Ltd., Ashton Gate Works, Bristol, BS3 2LQ. Telephone: 0272 664041. That's all that I can tell you. I hope that you find what you want.