BQKOZFIN Underarm Crutches for Adults x2 Units Height Adjustable 128-148 cm Armpit Crutches. No more struggling with large, bulky, full length crutch. Height Adjustable: Crutch are designed for people 5.7ft –6.4ft tall to help support ankle, knee, and leg injuries, helping you to walk with less strain on your injured body part.