Plain Rubber Ferrule (no metal washer inside)

Buy metal ferrules for your walking stick. These are spiked metal ferrules that can be glued on to the prepared (tapered with a knife or sander) tip of a walking stick. 
Please choose the diameter that exactly matches the diameter at the tip of your walking stick so that the rim of the ferrule is flush to the walking stick shaft for neatness. 
A rubber ferrule can be pushed on over the tip of the spike to use your walking stick on hard ground too.