DESCRIPTION ---Pack of four grey heavy duty hexagonal rubber ferrules ---To fit tubing diameter of 22mm (7/8") - please see photo above showing how to measure ---Large base for superior grip and long life - ideal for heavier users ---Ideal for crutches etc ---Reinforced with metal washer 100% Satisfaction Guarantee - we want you to be happy with your purchase so if you do have any problems please send us a message and we will do our best to sort it out. Should you feel that you need to leave negative or neutral feedback please give us the opportunity to rectify the situation first.