Noticed these on ebay http://www.ebay.co.uk/itm/Kold-Kutter-3-8-30-No-Wader-Wading-Boot-Studs-/281846298309?hash=item419f5936c5:g:60EAAOSwmrlUxZfA (http://www.ebay.co.uk/itm/Kold-Kutter-3-8-30-No-Wader-Wading-Boot-Studs-/281846298309?hash=item419f5936c5:g:60EAAOSwmrlUxZfA)
They are designed for tyres when driving/racing on ice.Seems a lot of anglers are using them in Canada and the US , sportfish are charging £3.30 for 1 simms hardbite stud :shock:! these must be worth a punt.