2piece set BQKOZFIN Underarm Crutches for Adults Height Adjustable 118-138 cm Armpit Crutches. No more struggling with large, bulky, full length crutches. Height Adjustable: Crutches are designed for people 4.9ft –5.7ft tall to help support ankle, knee, and leg injuries, helping you to walk with less strain on your injured body part.