Combi-Spike Ferrules Item#: Ice pick ferrule made of impact resistant plastic with galvinized plated steel center screw. These can be fit on the bottom of most wooden canes or hiking staffs for sure grip on ice and snow. Instalation is required for this item, cane bottom must be sized to accommodate tappered ferrule. Available in four sizes. Comes with rubber tip to cover spike for use on pavement or flooring. replacement tip #9320708