1" Treadmill Safety Key that fits on most Icon Treadmills
This is the main treadmill key that thousands of different treadmills use. Part # 119038 & #119039 (this key has 2 different part #'s) If your treadmill key looked like this and you own a Proform, Nordic Track, Weslo, or Health Rider Treadmill, then this is the key for you.
If still in doubt simply measure your key slot: