The Standard Anti Tipper with Wheels by Drive Medical is for use with Sentra Heavy Duty, Sentra Heavy Duty Extra Wide (26", 28", 30"), Sentra EC, Silver Sport 1 and 2, and Chrome Sport Wheelchairs. The Anti Tippers provide a secure and safe way of traversing curbs. For use with Sentra Heavy Duty Extra Wide (26", 28", 30") Silver Sport 1 and II, and Chrome Sport wheelchairs|Standard Anti-Tipper|Provides stability|Easy to install