A reformer cleat is a small yet essential component of a Pilates reformer machine and is attached to the frame of the reformer that holds the ropes or resistance cords in place.
 
The cleat allows the user to adjust the length and tension of the ropes, providing more control over the intensity of the exercises. By simply pulling the ropes through the cleat and securing them at the desired length, the user can customize their workout based on their needs and preferences. Cleats are especially useful in ensuring that the ropes stay firmly in place during various Pilates movements.