Insurance approved SAS Wheel clamp for your trailer or Caravan with Steel wheels Wheel clamp to fit 10-15″ steel rims and 110mm-195mm width tyres. Maximum wheel nut diameter 25mm, if your trailer/caravan steel wheel nut is larger, please consider the SAS HD3 Wheel clamp. 3 sizes of extension tube are available (an extra) for wider wheels with deep (inset) rims, to allow the wheel clamp to cover one wheel bolt correctly. One-piece wheel clamp that covers a wheel nut, wraps around the wheel and locks securely in seconds. This wheel clamp boasts of a high security steel encased lock and twin locking mechanism for maximum security. This SAS wheel clamp weighs under 5kg, making it ideal for touring, yet very secure for long term storage as well. Compact design makes it easy to store and is supplied in tough plastic carry case. Painted bright red for maximum visual deterrent and to put thieves off on sight.