What is it (for)?
It’s the drive wheel from this
https://extramachinery.com/products/linishing-attachment-50x915mm-la915u-for-industrial-grinderswivel-360-degree-with-adjustable-tool-rest
@dbr started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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What is it (for)?