NEW DESIGN 4x4 All-Terrain Tips fit many crutches and walking canes with a 3/4" shaft. These tips will NOT fit a crutch or cane with a 1" diameter shaft. The inside diameter of this crutch tip measures 11/16" or 18 millimeters which creates a great fit on any 3/4" diameter crutch or cane shaft. These tips allow users to navigate almost any terrain, including uneven surfaces and loose sand and gravel. The lightweight and sturdy compact design allows ease of use on stairs. Our non-slip enhanced traction design enhances user stability, and reduces fatigue associated with stress impact to your hand, wrist and elbow. Our all terrain crutch tips are made of a durable rubber composite which contributes to a lengthened life of the tip.