I am unsure of the name of these but in principle they go over the rim of your boot and allow your foot to slide in quite easily, some people still use them today, these look to be silver but bear no hallmark or stamp so may be an chromium alloy.

Dispatched with Royal Mail 2nd class small parcel.

Please take a moment or two and view my other listings on this site, I have something for everyone. I will combine postage where I can, thank you for looking.
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