Economy Knee Scooter, Sterling Grey. Patient Height Range: 4’11” to 6’6″. 250 lb weight capacity. Product measurement: 31″ (H) x 16-1/8″ (W) x 30″ (D). Knee platform: 14″ (L) x 7″ (W). Knee platform height adjustable from 13″ – 19″. Handle height adjustable from 31″ – 39″. Large 7″ wheels with sealed bearings.