This 1" safety key is a necessary accessory for Proform and Weslo treadmills, with part numbers 119038 and 119039. It is designed to ensure the safety of the user during workouts and prevent any accidents. This safety key is made by Treadmill Doctor, a trusted brand in the fitness industry. The safety key is compatible with a range of Proform and Weslo treadmill models and fits securely into the designated slot. It is made of high-quality materials and is durable, ensuring long-lasting use. This safety key is a must-have for anyone who wants to ensure a safe and effective workout on their Proform or Weslo treadmill. 1 Year Warranty