Product: Walking Stick Crutch Frame Ferrule Black Rubber 7/8 Inch 22mm ID Pack 200 | ToolSmart Condition: New Weight (kg/g): 4.02 Additional Information: These replacement ferrules are hard wearing and helps prevent slipping when used on walking sticks, crutches and walking frames etc. This range of ferrules comes in five different sizes This item is also available in a number of different size packs, offe • • • • •.