McKesson Push-Button Aluminum Crutches with Wing Nut Hand Adjustments Lighter than wood, the standard aluminum crutch provides stability and durability Double-extruded center tube provides additional strength to weight-bearing area Pushpin adjustment makes it easy-to-adjust crutch height in 1″ increments Non-skid, jumbo-size vinyl contoured tips provide excellent traction Easy wing nut adjustments for hand grips