Carex Crutch Tips are designed to provide skid-resistant traction and improve crutch durability. These tips come in two different sizes. Standard crutch tips have a base of 1-3/4" and Extra Large crutch tips have a base of 2-3/16". Both crutches are designed with an opening to fit 7/8" diameter tubing, which is a typical tubing diameter for most crutches.