Featherweight Aluminum Fore-Arm Crutch has aluminum casting on handle for extra strength. Double adjustable both the hand and cuff height. Measurements in fitting Lofstrand crutches to the patient are made from the palm of the hand to the floor with the arm parallel to the body. Weight capacity 250 lbs. Forearm height adjustments are measured from the top of the hand grip to the top of the cuff as follows: Adult & Extra Tall Child Size Kiddie Size 9 1/2"-11 1/4" 7 1/2"-8 1/4" 6" only Adult front opening vinyl covered cuff measures 3 1/2" across with an opening of 2 3/8". Child front opening vinyl covered cuff measures 3" across with an opening of 2 3/8".